[Serusers] 183 and no ringback tone

[Andreas Granig]

Hi,

following situation: a local user sets a call forward to a PSTN number. 
When someone from PSTN is calling this user, the call is routed back to 
PSTN via the same or another gateway (doesn't matter). The problem is, 
that the caller doesn't hear a ringback tone (because of the 183 this 
should be generated out of the rtp stream, afaik).
The Gateways are Cisco 5300.

When I call this user from a Cisco ATA and get forwarded to PSTN via the 
GW, I hear the ringback tone, so I think this might be a problem between 
the Gateways!?

I've attached the full sip trace of the call. I think you'll also need 
the RTP stream, but that isn't available, sorry. Btw, it doesn't help to 
  force the rtp stream over the SER's machine with rtpproxy, same 
problem here. ACLs on the Gateways are OK.

A hack would be to rewrite the 183 to 180, but I'd like to avoid such 
*really ugly* hacks :o)

Does anyone know this problem?

Regards,
Andy
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