[Serusers] SIP Diversion INVITE Messages

[Stephen Miles]

Hi all,

We have successfully managed to get Ser to act as a proxy between our 
backend SIP service and clients out on the Internet using the nathelper 
modules and RTP proxying.  However, one of the features of our SIP 
service allows you to dial a number via a web interface.  This appears 
to work by sending an INVITE from the SIP service out to the IP phone 
using the 'Diversion' and follow-me directives.  The problem we appear 
to be having is that the RTP information is setup not in the INVITE but 
rather in an OK status message returned when we pick up the phone to 
dial out.  From what I understand Ser does not look inside Status 
messages but only in the initial INVITE, hence when we use the web 
interface to dial out the SDP location is not being altered to point at 
our Ser proxy and therefore the RTP is not being proxied as we want.

We have tried various things but the issue appears to be that Ser will 
not look inside OK replies to INVITE's. We might be misunderstanding 
things here???  By the way all SIP messages are going through the proxy 
as desired... The only issue we have is with the RTP traffic.

Can anybody help us understand how to get around this problem (if in 
fact it is possible to get around it using Ser)

Cheers,

Steve


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