I need to setup a SIP trunk to Mitel. I have an IPIPgw providing SIP-H323 conversion. calls from the Mitel to CCM work fine, but calls from CCM to Mitel get dropped. debug on IPIPGW shows that SIP Invite gets sent to Mitel, but SIP 480 message gets sent back. the phone that we are trying to call does in fact ring once before the 480 comes back, and the debug shows the correct numbers going across in the invite.
all help appreciated!
SIP debugs for outbound call from IPIPGW to Mitel (names removed):
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