BT WHC sip not working properly

Hi

Try the following:

A) Equipment will only use the primary BT SBC IP address so will not provide automatic failover to the secondary.

B) PAID header should not be used therefore different Presentation and Network CLIs cannot be sent on a call by call basis.

C) Equipment does not specify Invite header request user=phone, ELG to correct in future software update

Also:

Codec priority 1 G711a
Codec priority 2 G729
Codec priority 3 G711u
Codec priority 4 None
Codec priority 5 None
SIP Session Timer Session Timer Usage: ON
Session Timer Value: 600

Proxy Server Address BT SBC Signalling IP Address
Domain BT SBC Signalling IP Address
Invite Acceptance Domain Only
DTMF Type 2833
ID Presentation Option
P-Asserted-ID: Unused
Remote-Party ID: Use
ID Presentation Option
ID Individuality From ID: Extension Outgoing-CLI
P-Asserted ID: Extension Outgoing-CLI
Remote Party ID: Extension Outgoing-CLI

are the sip trunks registration based ie are you using a user name and password to authenticate or is it ip based ?

PGM 126 - 10 - Is this set to MSN & DID or DID conversion? Take note of how many digits in 12.

If MSN & DID, PGM 202, enter your range, and confirm you have the numbers programmed
If DID only, PGM 231, enter your last x (value of 12 above) digits and confirm you have ring assignment programmed

If you setup a dummy number, and confirmed this was working, then returned another day to complete porting, the MSN/DID tables may not be programmed meaning when you are trying to call the number, carrier sends SIP Request through, system returns 404 no number found and client gets busy tone/call failed.

This is the starting point for me, but being aussie, BT may do things a bit differently. KISS (Keep it simple stupid) is my methology.