I had a strange issue when integrate a PRI gateway (2921) back to CUCM 9 use SIP trunk. A CUCM user can't put an PSTN incoming call to hold. The PSTN holdee gets dropped after 10 seconds. Compare the mid-call invite sent from the CUCM and received at he debug ccsip message of the Gateway, I can see the the CUCM mid-call invite the "contact" field ip address gets changed when arrived at the gateway. Which later cause the ACK can't sent back to the Gateway. I have change SIP profile in CUCM many times and SIP configure at gateway many times and am not sure what went wrong. Please help. Attached are the SIP messages from the CUCM and the Gateway. The only senario for this to work is check the MTP required.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
Over the last few months, I have had the privilege of working on SI...
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...