We have an issue where a caller calls in over the PSTN.
The call is answered o.k and both parties hear eachother. They then transfer the caller to a user on a different phone system ( A siemens PBX in this case). The ip phone user can consult with the transferee but after they have mad ethe transfer to the caller on the PSTN. neither party can hear eachother. (PSTN caller - Siemens phone) the problem is, it works occasionally, they seem to think it only fails when there are a lot of calls.
I am leaning towards an MTP issue on the Gateway, any ideas?