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Mobility manager doesn't work when going over ICT

Mobility manager is working properly if a phone on the same call manager or a phone through the PSTN calls but does not work if the call goes over the SIP trunk.  We can make it work by checking the MTP required on the ICT but this results in video calls that do not work.

When I call a person across the ICT both devices ring, his desk and his mobile.  If he answers on his mobile, he gets dead air and his desk phone just sits there, does not get a red light as it normally does.  My call continues ringing and then after about 10 seconds goes to a fast busy, any thoughts on what I should check?

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