As far as I know, HMP behavior is: - for inbound calls, it copies the To: header from the INVITE in the Contact: header sent in the 200 OK - for outbound calls, it copies the From: heder from the INVITE in the Contact: header used throughout the call If you want to set another thing into Contact: header, you need to build it yourself, and probably set it as persistent header for the duration of the call. Please check www.dialogic.com/.../globalcall_for_ip_hmp_v12.pdf chapter 4.9.8 Configuring Persistent SIP Header Chris
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