We are using speech server to initiate outboud calls to a Cisco box. Here is what is happening, I am really hoping that someone can help me out.
1. Speech Server (MSS) sends and INVITE sip request.
2. Cisco box (that is the gateway we use) reponds with 100 - trying
3. Gateway responds with 183 session progress
4. My phone rings and then Cisco sends a 200 OK to MSS
5. At this point it is my understanding that MSS should send an ACK and the call is set up. However, I never see the ACK from MSS so the gateway just drops the call.
If anybody knows what might be a problem here and how to fix it I would appreciate it. I am not sure if this is non-standard behaviour on the part of my gateway or MSS and if it is MSS then what should I do to get that ACK sent?
Thank you.
Goran.