Dialogic IMG - Map SS7 ISUP Messages to SIP

ISUP Message	SIP Message

ISUP Message	SIP Message
Initial address message (IAM)	INVITE
Address complete message (ACM)	180 RINGING / 183 PROGRESS
Answer message (ANM)	200 OK
Connect message (CON)	200 OK
Call progress message(CPG)	183 CALL PROGRESS
Release message (REL)	BYE/CANCEL
Release complete message (RLC)	NA
Reset circuit (RSC)	BYE/CANCEL (only for a call) *
Circuit group reset message(GRS)	BYE/CANCEL (only for a call) *
Circuit group blocking message(CGB)	BYE/CANCEL (only for a call) *
Suspend message (SUS)	Re-Invite or INFO **
Resume message (RES)	Re-Invite or INFO **

Upon reception of an RSC/GRS/CGB message, one SIP message is sent for each call association.

** 'Re-Invite' message is sent unless SIP-T is enabled. If SIP-T is enabled then the 'INFO' message is sent.

Dialogic Integrated Media Gateways