Hi all,
we have a MiCollab system that when the costumer dials out from the Mitel to some numbers they don't hear anything until the other side answer the call. This seems to happen when when the Mitel gets a 183 (session progress). When the Mitel receives a 180 (ringing) then the caller hears the ringing tone.
This applies to international numbers and they had experienced the same with toll free numbers. We have turned the option "Ignore SDP Answers in Provisional Responses" to yes and they are able to hear ringing tone on toll free numbers. But international calls in the example. They still do not hear anything.
Does someone has experienced this before and know a solution/workaround.
Many thanks.