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SIP - No Ringback on Forwarded Calls

ewilkinson
Level 1
Level 1

‎08-14-2014 02:56 AM - edited ‎03-16-2019 11:44 PM

Hi

I have a CUCM 8.5 and a CUBE out to a provider. Everything works except if a call is forwarded to either and internal or external number then the caller doesn't hear ringback. If you wait and the call is answered then it proceedes correctly.  I can get it to work by forcing MTP to be used but then the calls to the provider only advertise one codec which they don't like.

 

Just wondered if there is a way ruond this without using MTP...could it be a codec thing and the MTP is being used as a transcoder??

 

 

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4 Replies 4

George Thomas
Level 10
Level 10

‎08-14-2014 03:39 PM

It would be good to see the config on the CUBE and debug ccsip messages.

Please rate useful posts.
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dana.tong
Level 4
Level 4
In response to George Thomas

‎08-26-2014 03:26 PM

I have a working configuration template that supports supplementary services and ringback on transfer without the need for an MTP. Do you want to email me off list?

0 Helpful

ewilkinson
Level 1
Level 1
In response to dana.tong

‎08-27-2014 11:57 PM

yes please

0 Helpful

andrew.munday
Level 1
Level 1
In response to dana.tong

‎08-05-2015 07:23 PM

Dana, are you please able to post or email your config for this? We are experiencing the same issue on our CUCM 8.5 after migrating to SIP.

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