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.