âMandatory information element missingâ indicates that the equipment sending this cause has received a message which is missing an IE that must be present in the message before the message can be processed.
Channel is always mandatory in the first response we receive from the peer. But, for the user-side, some implementations allow user not to respond with a channel-id in which case network-side need to assume the channel that was sent in SETUP.
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...