Billion Modems and Gigaset C470IP compatibility

Seems like there is an issue with Billion ADSL modems (such as the Billion 7404VGO) and independent VOIP telephony devices (such as the Siemens Gigaset C470IP) where the Billion, even though it's not configured for VOIP, grabs traffic on the SIP/RTP ports and doesn't let it through to the VOIP handset. The solution? Move the SIP port to 15060 and RTP to 15004-15020.

And how's the Gigaset C470IP working out? Fantastic! Easy to use, configures easily, looks good, passes the WAF test, and the audio quality is very nice.

Update: The easier solution is to turn off the Billion 7404VGO's 'SIG ALG' setting, which is found on Configuration->Firewall->General Settings. Thanks Peter for the tip...

tech/gadgets | 12 Apr 2009 | #