I ran into the same problem until I found the answer:
http://lists.digium.com/pipermail/asterisk-users/2004-March/040488.html
Either you have 'signaling forward unconditional' inside voice service voip or in a dial-peer.
IPTel SEMS, Asterisk and many other SIP Implementations (including IP Phones from Zyxel and Grandstream among others) don't understand SIP Messages with MIME encapsulation. Cisco does this when it has too much information to send (i.e., additional signaling info, specially if your gateway is ISDN or SS7), and most SIP stacks don't implement that.
Regards, E.
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