This document explains "How to Add/Modify the User-Agent SIP header in the SIP Profiles ?" . Sometimes SIP header Modification is required in a Service provider network where the Device rejects an unknown header and expects optional header value or parameter.
I have a Voice Gateway with E1 ISDN PRI connection terminated to the Service Provider. I want to assign only 15 channels to this specific operator and rest to some other Service Provider. Is this Possible ?
Sample SIP INVITE message with the User-Agent name ( field is highlighted in bold):