Core Issue
The call forwards the no answer and busy destinations to another phone on the same system or to the Cisco Unity Express fails when the call is initiated from a Cisco CallManager 5.0 on a SIP Trunk to Cisco CallManager Express. After the phone rings and the timeout (10s) caller gets a fast busy.
Resolution
Complete these steps in order to resolve this issue:
voice service voip
allow-connections sip to sip
telephony_service
call-forward pattern .T
- Ensure that these commands are added in the Cisco CallManager Express Configuration. When this command is used, then on no answer or busy, Cisco CallManager Express sends a 3XX Moved or REFER back to Cisco CallManager and expect the Cisco CallManager to send a new Invite to Cisco Unity Express.
- Configure the call-forward b2bua noan command in order to set the Cisco CallManager Express source address as the 302 redirect contact address. Add this command to the incoming dialpeer:
dial-peer voice 4 voip
description ** to HQ **
incoming called-number 40..
!-- Add this
b2bua
!-- Add this
destination-pattern 2...
For more information Command Lookup Tool
Problem Type
Call connection (Connection quality: One-way audio, no busy tone, dropped calls, etc.)
Call control software (CallManager, CallManager Express, ICS7750, SRST, SS7 call agents)
Call Control
CallManager express
CallManager
Call Connection
Call initiation
Reorder tone
Failure Type
Cannot forward or reply
Cannot perform routine, step, function, etc.
SIP Features
SIP trunk
CallManager Versions
CallManager 5.x
Supplementary Services
Call forward
