CUCM starting connection with unknown media server.

[tomas edwards]

Hi.

Lets say you have a SIP server. A CUCM is connected to this SIP server via a SIP trunk. A call is established from the external sip server to the CUCM. The calling phone press "on hold " function(the phone registered in the external SIP server). The external SIP server, sends an INVITE to the CUCM asking to initiate an RTP stream with an external media server(so the CUCM phone can receive music on hold). The CUCM has no knowing of this external media server.

It's possible to tell the CUCM to accept this session with the external media server?

I think the external SIP server, who knows about the media server existence, should proxy the connection between the media server and the CUCM(like an CUCM MTP).

SIP server---------------------------------------------------------------CUCM

                                  |

                                  |

                         Media server

Thanks.

[George Thomas]

The phone on CUCM that is being put on hold will be asked to connect to this "media server" and in theory as long as the phone has ip connectivity to the "media server", this should work fine. 

[tomas edwards]

Yes, it works when a SIP phone is registered in the CUCM. But if it's a SCCP phone it doesn't work.