Capture the SIP packets from/to the gateway and take a look at the SDP. I Don't know if Cisco can handle this scenario (sending RTP to itself) proper.

regards, klaus

Steve Blair wrote:

Thanks I guess but the problem is that if a call comes in from the PSTN to an IP phone via a Cisco 2620 gateway and is then transferred back through the same gateway to a Centrex extension the call connects but no media is exchanged.

Klaus Darilion wrote:

...

Hi Steve!

You don'T have to do anything special for call transfer. Call transfer is end2end feature - implementied by the SIP clients. The REFER message will be forwarded by the SIP proxy as any other message.

regards, klaus

Steve Blair wrote:

...

Hello:

I have a Cisco 7960 running v7.3 SIP image. The phone registers to SER 0.8.14 stable. Everything works fine except call transfer. Has anyone experienced problems with call transfer? Has anyone done anything specific in their ser config to handle call transfer?

Thanks,Steve