Cisco SPA303 - Page 10

Phone.com Setup and Troubleshooting Guide
Cisco SPA303 IP Phone
Revised: May 28, 2014 Page 10 of 11
If you have a router that doesn’t let you disable SIP ALG, consider
purchasing a different router that either doesn’t have SIP ALG, or
lets you disable it. Check out the table in the Network Hardware
Recommendations section for general guidelines.
If replacing your router isn’t a viable option, you could put one
phone in your router’s DMZ. Although this will expose your phone
to the open Internet, it eliminates the SIP ALG issue without
requiring you to purchase new hardware.
Network Hardware Recommendations
The table below isn’t comprehensive, but provides general
recommendations and notes for selected router manufacturers.
Apple, Cisco, DD-WRT,
Linksys, WatchGuard
XTM
Usually works with Phone.com
without any configuration
changes
Actiontec, Asus,
Comtrend, D–Link,
Motorola Netopia,
Siemens SpeedStream,
SonicWALL TZ,
SonicWALL NSA, Ubee,
Westell
Usually requires configuration
changes (i.e., bridging or
disabling SIP ALG)
2Wire, Arris, Belkin,
NetGear, SMC, ZyXEL
Incompatible with Phone.com
service