Introduction
The following is a list of known routers and modems which we have determined to be compatible, incompatible or compatible with changes to the configuration of the device. We have also provided a list of devices which we are aware of but have not yet tested ourselves.
We highly recommend checking all network equipment on site against this list before deploying our Hosted PBX service in your office. If your router is not listed, please contact support@telair.net to discuss. Should you have additional information on a device and would like to add your findings to our list, please contact us.
Whenever possible you should choose a router that has QoS (Quality of Service) if you plan to share the same Internet connection with non-VoIP services (such as desktop computers). We also recommend that you always make sure your modem is bridged and updated to the newest firmware available before troubleshooting unless otherwise specified by this guide. This list is updated frequently and we recommend you check back periodically for any updates.
Quick Links
- Compatible Devices
- Devices compatible with changes required
- Incompatible Devices
- Devices not tested
- List of Devices by Name
Compatible Devices
Apple Airport
Current Status: Compatible
Recommendation: Suitable for 1-3 phones
Comments: There are no known issues with this router although it is best used for smaller offices (1-3 phones). This device is not believed to offer QoS which may be a drawback in certain deployments.
Cisco RV180W
Current Status: Recommended
Comments: This is a business-grade multifunction router, including Gigabit Ethernet, VPN and Wireless-N capabilities. We deploy this unit on a regular basis and are able to recommend it for a range of small to medium business needs.This unit offers four Ethernet ports; consider adding an unmanaged switch if you require more ports.
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Linksys E1200
Current Status: Compatible
Recommendation: Recommended
Comments: Suitable for small office of 2-5 phones
Linksys E2500
Current Status: Compatible
Recommendation: Recommended
Comments: Suitable for small office of 2-5 phones and offers stronger Wi-Fi than the 1200 with Wireless-N.
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Linksys E3500
Current Status: Compatible
Recommendation: Recommended
Comments: Suitable for small office of 2-5 phones, and offers very strong Wi-Fi.
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Linksys WRVS4400N
Current Status: Compatible
Recommendation: Recommended
Comments: This is an excellent router with all the features of the RV-series routers (above) that also offers Wireless-N connectivity and Gigabit Ethernet speeds. The router has four ports; if more are required we recommend connecting an unmanaged switch to the WRVS4400N.
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Linksys WRT160N
Current Status: Compatible
Recommendation: Suitable for 1-2 Phones
Comments: There are no known issues with this model router at present. The router does not offer QoS, but this may not be a major issue in offices with only one or two employees. We would not recommend this router for larger-scale deployments.
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Linksys WRT54G2
Current Status: Compatible
Recommendation: Recommended for 1-2 phones
Comments:
This router is compatible and recommended for 1-2 sip phones. Appears to have problems with 3 or more SIP phones caused by NAT issues. Use DDWRT firmware instead in this case if hardware revision allows for this.
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Siemens Speedstream
Current Status: Compatible
Recommendation: Suitable for 1-3 Phones
Comments: There are no known issues with this router. This router has no QoS (Quality of Service) which is a drawback if you are using it in an environment where there are computers or other non-VoIP equipment. We would not recommend this device for larger-scale office deployments.
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Sonic Wall
Current Status: Compatible
Recommendation: Firmware v5.8.12 or lower, Disable SIP ALG
Comments: Firmware v5.8.13 and higher contain a bug that causes issues with incoming calls. We recommend customers set enable ‘Consistent NAT’ (check the box) and disable ‘SIP Transformations’ (uncheck the box). Ensure that the MTU is set correctly for your ISP.Select the Firewall Settings -> Edit LAN>WAN Rule -> AdvancedTCP Connection Inactivity Timeout (minutes) to 60
UDP Connection Inactivity Timeout (seconds) to 3600Select the Firewall -> Access Rules and add a new rule with the following:
Service: Any
Source: WAN, Address Range 184.107.47.69 to 184.107.47.71
Destination: LAN, Address Range * to *
Comment: Telair Office Phone D1
If there is an option for ‘Allow Fragmented Packets’ then please enable this option.
TCP Connection Inactivity Timeout (minutes) to 60
UDP Connection Inactivity Timeout (seconds) to 3600
Select the Firewall -> Access Rules and add another new rule with the following:
Service: Any
Source: WAN, Address Range184.107.47.69 to 184.107.47.71
Destination: LAN, Address Range * to *
Comment: Telair Phone D2
If there is an option for ‘Allow Fragmented Packets’ then please enable this option.
TCP Connection Inactivity Timeout (minutes) to 60
UDP Connection Inactivity Timeout (seconds) to 3600
Devices compatible with changes required
2Wire Routers and Modems
Current Status: Possibly compatible after Changes
Recommendation: Disable SIP ALG or Bridge to Supported Router
Comments: To use this router you need to login to the web interface for the router and disable the ‘SIP ALG’ setting on it. If this option is not available you will need to bridge the router to a compatible router so that the 2wire router acts as a simple modem rather than a router.If bridging is not possible either, you must replace this device as it will prevent you from using our service.
Cisco Routers (general)
Current Status: Compatible; may require changes
Recommendation: Confirm model with Telair Phone
Comments: The Cisco routers we have encountered appear to be quality devices that are compatible with our service, but may require some changes.Cisco 837:The router’s NAT service for SIP should be disabled, with the command:
no ip nat service sip udp port 5060
Cisco Linksys RV082, RV016, RV042
Current Status: Compatible if correct firmware version is used
Recommendation: Recommended
Comments: This family of routers will work well with our Hosted PBX services so long as the firmware version on the unit is v4.0.4.02 or earlier. Later versions appear to cause issues. The MTU settings under ‘Setup’ -> ‘Network’ should be set to 1500 (Cable) or 1492 (DSL). The RV series offer an excellent QoS feature which is an advantage over most competing routers.If you have a large number of devices to connect to your router, the 4-port RV042 may not offer enough ports for you. In this case, choose the RV082 or RV016 for their larger number of ports, or alternatively purchase an unmanaged switch and connect it to your RV042 to increase its port capacity.
D-Link DIR-615
Current Status: Compatible after Changes, Hardware Revision B Only
Recommendation: Disable SIP ALG
Comments:
This applies to Hardware Revision B only. Other hardware revisions are not compatible with VoIP as they do not have the disable SIP ALG option.This router has known issues with VoIP services if SIP ALG is not disabled. We recommend disabling the SIP ALG setting on the router available in firmware releases 2.2.4 and higher. This option is available within the firewall settings under the ‘Application Level Gateway (ALG) Configuration’. The SIP option should be unchecked.
D-Link DIR-625
Current Status: Possibly Compatible after Changes
Recommendation: Disable SIP ALG
Comments:
We recommend disabling SIP ALG through the DIR-625’s web interface. After the change, this router appears to be compatible and able to serve up to three or four phones. Customers who have tried to connect a larger number of phones to this router have found that the additional phones fail to register with our server. We would not recommend this router for a larger-scale deployment as it does not appear to perform reliably.
D-Link EBR-2310
Current Status: Compatible after Changes, Hardware Revision B Only
Recommendation: Disable SIP ALG
Comments:
This applies to Hardware Revision B only. Other hardware revisions are not compatible with VoIP as they do not have the disable SIP ALG option.This router has known issues with VoIP services if SIP ALG is not disabled. We recommend disabling the SIP ALG setting on the router available in firmware releases 2.2.4 and higher. This option is available within the firewall settings under the ‘Application Level Gateway (ALG) Configuration. The SIP option should be unchecked.
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Fortigate/Fortinet
Current Status: Compatible after Changes
Recommendation: Disable SIP ALG
Comments:
In the CLI of the fortigate type the following:config system settings
set sip-helper disable
set sip-nat-trace disableReboot the deviceIn the CLI type the following:Config system session-helper
show
(now look for SIP, mostly it will be “12”)
delete 12Don’t use any protection profiles on the firewall of the sip rules.
Juniper – Netscreen
Current Status: Compatible after Changes
Recommendation: Disable SIP ALG
Comments: You must disable the SIP ALG on the Netscreen router. Navigate to the ‘Configuration’ page and choose ‘Advanced’. Then choose ALG and un-check the SIP check box.
Motorola Surfboard
Current Status: Compatible after changes
Recommendation: Disable SIP ALG and ensure appropriate firmware is running
Comments: The following changes/checks are required:
1) Must be running firmware v3.3 or higher
2) Must have SIP ALG disabled.
Netgear FVG318
Current Status: Compatible after Changes
Recommendation: Update firmware and disable SIP ALG
Comments:
This router is known to cause issues related to storing configuration and failed firmware downloads with Aastra series phones. Aastra phones on this router require frequent reprogramming and firmware replacement. This router appears to work with VoIP services with the SIP ALG setting is disabled. The router does not work properly with VoIP with the SIP ALG setting enabled (which is enabled by default). You should make sure you have the most recent firmware for this router before using it. To disable the SIP ALG, first login to your router and select ‘Rules’ from the left hand side menu. Next, check the box that says ‘Disable SIP ALG’.
Netopia
Current Status: Possibly compatible after changes
Recommendation: Disable SIP ALG or replace device
Comments:
Netopia has SIP Passthrough “on” by default and will not work with VoIP services properly unless SIP ALG is disabled. (Or SIP ALG in newer models) In order to work with voice-over-IP, you must turn SIP Passthrough (SIP ALG) off. Note that not all Netopia routers may allow this change; if yours does not you must replace the device with a compatible router in order to use our service.
The SIP ALG setting is not in the web gui. You have to telnet into therouter, then type. Each line is a new command.
configure
set ip sip-passthrough off
save
exit
Restart
On the Netopia 4622xlt
Telnet into the device
Use the arrow keys to highlight ‘quick menu’ and press “ctrl-n”
That brings you to the console.
type:
ip nat alg sip enable no
save
exit
restart
SMC 3100
Current Status: Possibly compatible after changes
Recommendation: Bridge device to supported router
Comments: This router is not compatible with VoIP services unless it is bridged. We recommend bridging the router to alternative router so that it acts as a modem only.
Tomato Firmware Routers
Current Status: Possibly compatible after changes
Recommendation: Adjust router settings
Comments: We have encountered a scenario in which a router running the Tomato firmware would only let one phone register at a time. We were able to resolve this problem by entering the router settings, under ‘Advanced’ and then ‘Conntrack/Netfilter’, where we enabled the SIP option for ‘Tracking/NAT Helpers.’ The router on which this was encountered was an Asus RT N16 but this issue and resolution may apply for other routers running Tomato.
Zxyel
Current Status: Possibly compatible after changes
Recommendation: Disable SIP ALG or bridge device to router
Comments:
This router is not compatible with VoIP services without modifications. We recommend either bridging the device to another router or disabling the SIP ALG. To disable the SIP ALG you must first telnet into the router/modem. Choose (24) System Maintenance and (8) Command Interpreter Mode. From the command line type:
ip nat service sip active 0
You will receive the message “SIP ALG Disable”
Incompatible Devices
Actiontec GT704WG
Current Status: Not Compatible
Recommendation: Replace device
Comments:
This router is not SIP Compatible. Drops calls after 20 seconds.
Asus RT-N66U
Current Status: Not Compatible
Recommendation: Replace device
Comments:
This router is not SIP Compatible. It has no SIP ALG or SIP Fixup options and does not work with polycom, aastra or cisco phones.
Belkin
Current Status: Not Compatible
Recommendation: Replace device
Comments:
This router is not compatible with VoIP services. We cannot support this router in any way and it must be replaced before using our service.
D-Link DIR-825
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router is not compatible with VoIP.
D-Link WBR-1310
Current Status: Not Compatible
Recommendation: Replace Device
Comments: This router is not compatible with VoIP applications as it lacks an option to disable the internal SIP ALG which interferes with IP Telephones.
Linksys WRT54G, WRT54GX, WRT54GL, WRT54GS
Current Status: Not Compatible
Recommendation: Replace Device or Replace Firmware
Comments: This router is not recommended for use with VoIP services using the stock firmware from Linksys. This model router is known to damage and modify SIP packets in such a way that it prevents VoIP packets from being formatted correctly and can cause a multitude of problems.
You may be able to install custom firmware such as DD-WRT () as a replacement. Note that the procedure does require some technical knowledge and ability. The DD-WRT firmware allows you to disable SIP ALG and enable QOS (Quality of Service), but this has not been tested in our labs yet.
Thompson TG-585
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router is not compatible with VoIP services. There is no method to disable the internal SIP ALG on device. Other customers have found that bridging the device to a compatible router did not result in a workaround. We recommend replacing this device with a compatible modem and router. Back to Top
Netgear FVS318
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router is not recommended for use with VoIP services. This router causes issues related to storing configuration and failed firmware downloads with Aastra series phones. The router appears to work some of the time but lacks the ability to disable the SIP ALG which causes intermittent issues with phone service. If possible we would recommend avoiding this router until Netgear makes it possible to disable the internal SIP ALG setting on the router to be compatible with voice-over-IP. Back to Top
Netgear WGR614
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router lacks the ability to disable SIP ALG and is not compatible with VoIP services. Back to Top
Netgear WGT624
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router lacks the ability to disable SIP ALG and is not compatible with VoIP services. Back to Top
Netgear WRN2000
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
This router lacks the ability to disable SIP ALG and is not compatible with VoIP services. Back to Top
SMC routers – general
Current Status: Not Compatible
Recommendation: Replace Device
Comments:
Most SMC routers do not appear to be compatible with VoIP services. We would suggest that you either replace this router with a compatible one or attempt to bridge it to another router. Back to Top
Devices not yet Tested
Cisco Pix
Current Status: Untested
Recommendation: Untested
Comments:
We have Untested this router in our labs, but the following information may be helpful.The cisco pix firewall requires that in version 7.0 or later look at the “inspect” fields. (Prior to version 7 it was called “fixups” not “inspect”.) Make sure that the “inspect SIP” field is NO. “Oo inspect sip” is the proper setting.With ‘inspect sip’ on the PIX firewall replaces the internal IP address of the phone with the external IP address. We use both pieces of information to accurately deliver the call. The internal IP address must be inside the SIP packet for proper functioning. Back to Top
D-Link DI-524
Current Status: Untested
Recommendation: Untested
Comments:
This router has not been tested for compatibility with VoIP services. We recommend testing the router before using in a production environment. Back to Top
D-Link DI-604UP
Current Status: Untested
Recommendation: Untested
Comments:
This router has not been tested for compatibility with VoIP services. We recommend testing the router before using in a production environment. Back to Top
D-Link DIR-628
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
This router has not been tested for compatibility with VoIP services. If the router has an option to disable SIP ALG we would recommend disabling it. Back to Top
D-Link DIR-655
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
This router has known issues with VoIP services if SIP ALG is not disabled. We recommend disabling the SIP ALG setting on the router. This option is available within the firewall settings under the ‘Application Level Gateway (ALG) Configuration’. The SIP option should be unchecked. Back to Top
D-Link DIR-855
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
This router has known issues with VoIP services if SIP ALG is not disabled. We recommend disabling the SIP ALG setting on the router. This option is available within the firewall settings under the ‘Application Level Gateway (ALG) Configuration’. The SIP option should be unchecked. Back to Top
D-Link DGL-4100
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
We suggest trying to disable SIP ALG by going into the router’s web interface and selecting Advanced -> Firewall -> Application Level Gateway and disabling (unchecking) the SIP checkbox. Back to Top
Dynex Routers
Current Status: Untested
Recommendation: Untested
Comments:
These routers have not yet been tested for compatibility with VoIP services. We recommended testing the router before deploying in a production environment. Back to Top
Firebox Routers
Current Status: Untested
Recommendation: Untested
Comments:
These routers have not yet been tested for compatibility with VoIP services. Discussions with engineers at Firebox indicate that the router is not likely compatible with SIP based devices such as IP telephones due to NAT concerns. We recommended testing the router before deploying in a production environment. If the router has SIP ALG or SIP Translations we would recommend trying to disable them. Back to Top
Hitron CGN3 (Rogers Advanced WiFi Modem)
Current Status: Not Compatible
Recommendation: Replace Device or Bridge it to a compatible router.
Comments:
The router feature of this device lacks the ability to disable SIP ALG and is not compatible with VoIP. We recommend that it be replaced with a standalone modem and router that is compatible, or that it be bridged to a router is compatible. We DO NOT recommend placing a phone on the DMZ of this decvice as it would compromise the security of the phone.
Hotbrick Routers
Current Status: Untested
Recommendation: Untested
Comments:
These routers have not yet been tested for compatibility with VoIP services. We recommend testing the router before deploying in a production environment. If the router has SIP ALG or SIP Translations we would recommend trying to disable them. Back to Top
Linksys BEFSR41
Current Status: Untested
Recommendation: Untested
Comments:
This router has not been tested for compatibility with VoIP services. Back to Top
Linksys RVS4000
Current Status: Untested
Recommendation: Untested
Comments:
We have not yet tested this router in our labs, but due to its similarity to the RV series routers (which are recommended) we believe it may be compatible.However, the SIP ALG setting on this router should be disabled. To disable the SIP ALG you will need to login to the web interface and select ‘Firewall’ and then ‘Basic Settings. Make sure that the ‘SIP Application Layer Gateway’ is set to ‘Disable’. Back to Top
Linksys WRT110N
Current Status: Untested
Recommendation: Untested
Comments:
This router has not been tested with VoIP services to determine compatibility. We recommend testing it prior to deploying it in a production environment. Back to Top
Linksys WRT310N
Current Status: Untested
Recommendation: Untested
Comments: This router has not been tested to determine compatibility with VoIP services. We recommend testing the router first before deploying it in a production environment. Back to Top
Linksys WRT350N
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
Firmware release 1.03.7 on Sept 14, 2007 introduced an internal change that disables SIP ALG within the software. SIP ALG interferes with VoIP services and we would suggest trying to upgrade to this firmware version or higher. This router has not been tested for VoIP compatibility. Back to Top
Linksys WRT610N
Current Status: Untested
Recommendation: Disable SIP ALG
Comments:
This router has not been tested for VoIP compatibility. If this router has a SIP ALG setting we would suggest disabling it. Back to Top
Thompson TG-585
Current Status: Untested
Recommendation: Untested
Comments:
The internal SIP service needs to be disabled. You will need to use a telnet (port 23) client to connect to the ip address of this router using putty or another telnet client. The username and password is the same as the one used to access the Web UI (default username Administrator). You will need to first login to the Web UI to and change the password before you can telnet into the device. Once connected to the router you will need to type these commands:connection unbind application=SIP port=5060
save all.Back to Top
Thompson Speedtouch ST-585
Current Status: Untested
Recommendation: Untested
Comments:
The internal SIP service needs to be disabled. You will need to use a telnet (port 23) client to connect to the ip address of this router using putty or another telnet client. The username and password is the same as the one used to access the Web UI (default username Administrator). You will need to first login to the Web UI to and change the password before you can telnet into the device . Once connected to the router you will need to type these commands:connection unbind application=SIP port=5060
save all. Back to Top
Trendnet Routers
Current Status: Untested
Recommendation: Untested
Comments:
This router has not been tested for compatibility with VoIP services. We recommend testing it extensively before using it in a production environment.
List of all Devices, by Model
- 2Wire
- Actiontec GT704WG
- Apple Airport
- Belkin
- Cisco RV180W
- Cisco Routers (general)Cisco Pix
- D-Link DI-524
- D-Link DI-604UP
- D-Link DIR-615
- D-Link DIR-625
- D-Link DIR-628
- D-Link DIR-655
- D-Link DIR-825
- D-Link DIR-855
- D-Link DGL-4100
- D-Link WBR-1310
- D-Link EBR-2310
- Dynex Routers
- Fortigate / Fortinet
- Firebox Routers
- Hitron CGN3
- Hotbrick Routers
- Juniper – Netscreen
- Linksys E1200
- Linksys E2500
- Linksys E3500
- Linksys BEFSR41
- Linksys RV082, RV016, RV042
- Linksys WRVS4400N
- Linksys RVS4000
- Linksys WRT110N
- Linksys WRT160N
- Linksys WRT310N
- Linksys WRT350N
- Linksys WRT610N
- Linksys WRT54G, WRT54GX, WRT54GL, WRT54GS
- Linksys WRT54G2
- Motorola Surfboard
- Netgear FVS318
- Netgear FVG318
- Netgear WGR614
- Netgear WGT624
- Netgear WRN2000
- Netopia
- Siemens Speedstream
- SMC 3100
- SMC Routers
- Sonic Wall
- Thompson Speedtouch ST-585
- Thompson TG-585
- Tomato Firmware Routers
- Trendnet Routers
- Zyxel