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New Member

CUCM SIP trunk region problem

Hello everybody

I'am facing problem regarding outgoing calls via SIP trunk from CUCM to external IVR. I put SIP trunk in region B. When I put telephone in region B everything is ok with g711 codec. Problem is when I put telephone in region A. Region A relationship with Region B is set to g711. In such case call fails. I used sniffer to look into SIP session beetwen CUCM and IVR and it looks like this:

CUCM -> IVR Invite with SDP offering g711

IVR -> CUCM Trying

IVR -> CUCM OK with SDP offering g711

CUCM -> IVR ACK

CUCM -> IVR Bye with cause 47

IVR -> CUCM OK (cute )

As I can see 47 indicates a "resource unavailable" event. Any clues about that. it is g711 to g711 so there's no need to transcode.

Thanks

  • IP Telephony
1 REPLY
New Member

Re: CUCM SIP trunk region problem

OK. I found the solution. Codec negotiation is beetween MTP device and IVR device so I had to set proper relation between regions of phone, MTP and SIP trunk. Now call is established perfectly.

Best

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