I am having trouble forwarding an incoming (ISDN BRI) call to an external (same ISDN BRI) destination. Any help is greatly appreciated.
I have an extension 794 on an IP Phone. It will act as an attendant phone. It will be used to forward to a group of phones by extension 100 (using overlays). When everybody is gone, the extension will have a CFWDALL to an external destination.
1) Incoming ISDN calls to the IP phone work.
2) Outgoing calls from the IP phone to ISDN work.
3) Another IP phone calling the IP phone with an external CFWDALL destination works.
4) Incoming call being forwarded to the external destination via CFWDALL doesn't work.
The cause code is:
Cause i = 0x82E46C - Invalid information element contents
I suspect that the Telco doesn't like my outbound calling number (which is the same as the inbound calling number). However, I would have expected a cause code of:
Cause i = 0x829C - Invalid number format(incomplete number)
I thought I'd have handled the calling number issue with my translation profile 111 below....
Your CO is indeed a bit strange, as it doesn't disconnect immediately.
interface bri 0/0
isdn map address . type unknown plan unknown
Then, you should use isdn tei-negotiation preserve, configure trunk-group if using both BRIs, I also think you don't need to use 0 for a PBX in the Netherlands, due to the fact that all numbers begin with 0 or 1.