SIP to Q931 Gateway - Delayed response to 486 User Busy
I have 28xx and 5350 routers with E1 cards, acting as Voice Gateways, converting from SIP to Q931.
I have the following problem:
1) Inbound call on the Q931 interface (SETUP)
2) SIP INVITE sent by VGW to customer SIP Endpoint
3) Endpoint replies with 100 Trying
4) VGW sends Call Proceeding and Progress via Q931
5) Endpoint sends 486 User Busy
6) VGW ACKs the 486
7) VGW sends DISCONNECT via Q931
The problem I am having is that between steps 6 & 7 there is a 10 second delay. There is no delay on the SIP leg of the call (from INVITE to ACK takes 0.17 seconds) so it seems that the VGW is not acting on the 486 for 10 seconds.
Has anyone got any suggestions regarding this problem?
Re: SIP to Q931 Gateway - Delayed response to 486 User Busy
Cause i = 0x8091 - User busy.
This is because the called system acknowledges the connection request. However, the system cannot accept the call because all B-channels are in use. The user equipment is compatible with the call in this situation.
If you have multiple ISDN circuits, the telco can configure them in a "hunt-group", in which calls switch to the next available circuit.
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