Hi, I'm setup the Asterisk 1.4.33 and try test it with the PortSIP SDK( www.portsip.com), but seems the video does not works. When I make the call from PortSIP SDK Demo to GrandStream GXV3140, it's working fine if no video codec selected. If make call with H.264 codec, the PortSIP got "503 service unavailable" response from Asterisk, why? Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20100623/cc5bd42f/attachment.htm