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.
Asus RT-N12
Current Status:Not Compatible
Recommendation:Replace device
Comments: After testing this device using firmware version 1.0.1.4 we have determined that it will not work at this time. The Router would not allow SIP packets to pass through to our SIP Proxies in any form.
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.
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.
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.
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.
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.
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.
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.
List of routers with SIP ALG enabled
The following is a list containing SIP ALG router models, their issues and how to disable SIP ALG (enabled by default in most of the cases).
Motorola
Models: SBG6580 (SurfBoard Extreme Wireless Cable Modem Gateway)
- No Registeration possible behind NAT as the device changes Call-ID and causes the responses to be discarded by SIP clients/ATAs
- No Solution at this time (SIP ALG, called SIP Pass Through, can not be disabled) .
- Must disable NAT and put the device in bridge mode. (See this guide)
SpeedTouch
Models: ST530 v6 (firmware >= 5.4.0.13) comes with SIP ALG enabled by default.
NAT type: symmetrical
Issues:
- No incoming calls.
- It replaces the private IP appearing in SIP headers with the public IP using a dumb text replacement. If for example the private IP appears in the "Call-ID" it replaces it too (that it's completely unnecessary).
To disable SIP ALG:
~# telnet router
-> connection unbind application=SIP port=5060
-> saveall
Zyxel
Models: 660 family comes with SIP ALG enabed by default.
NAT type: symmetrical
Issues:
- No incoming calls.
- SIP protocol broken making 50% of outgoing calls impossible because the wrong values are inserted into SIP headers.
To disable SIP ALG:
~# telnet router
Menu option "24. System Maintenance".
Menu option "8. Command Interpreter Mode".
ip nat service sip active 0
Netgear
Models: WGR614v9 Wireless-G Router, DGN2000 Wireless-N ADSL2+ Modem Router
Firmware V1.0.18_8.0.9NA
To disable SIP ALG: From Wan Setup Menu, NAT Filtering, uncheck the box next to "Disable SIP ALG"
SMC
Models: ToDo
NAT type: No symmetrical
Issues:
- The ALG doesn't replace the private address in "Call-ID" header (that is correct) but it does replace the "call-id" value in "Refer-To" header so SIP transfer is broken.
To disable SIP ALG: ToDo no ALG related options found via web and telnet. No idea of how to dissable it.
Linksys
Models: WRV200, WRT610N
NAT type: Symmetrical
Issues:
- The ALG replaces the private address in "Call-ID" header (not needed at all). Some phones (as Linksys with latest firmware) encode the "Call-ID" value in the "Refer-To" header (by escaping the dots) so the private IP appearing there is not replaced with the public IP. This causes that the call transfer fails since the proxy/PBX/endpoint will not recognize the dialog info.
To disable SIP ALG: ToDo no ALG related options found via web and telnet. No idea of how to disable it.
To disable SIP ALG on WRT610N: Web Interface: Administration, Management, under side heading 'Advanced Features' SIP ALG, can be disabled.
Peplink Multi-WAN routers
Models: All multi-WAN models
To disable SIP ALG, go to http://<router.LAN.IP>/cgi-bin/MANGA/support.cgi
Click the "Disable" button under "SIP ALG Support"
Issues:
- We are not aware of any SIP ALG issues, but if you just want to turn it off, here you go.
Fortinet
Models: All models come with SIP Helper enabled by default
To disable SIP helper:
~# telnet firewall
config system settings
set sip-helper disable
set sip-nat-trace disable
end
config system session-helper
show <---- use this to find out which entry is configured for typically 12 or 13
delete 12
end
The preferred solution is to configure the SIP ALG. Policies that use the SIP ALG will not use SIP helper. Full documentation at http://docs.fortinet.com then pick FortiOS for the version on your device, then VoIP solutions: SIP.
Cisco
Models: 800 Series
To disable the NAT services for SIP in IOS, just run these commands:
no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060
Juniper / Netscreen
Models: SSG Series
To disable SIP ALG:
In the Web interface: Security -> ALG
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