we are using a c6921 (SCCP-22.214.171.124) with CME 8.6. If you make a call, press hold and try to make a new call, a message about no channels availabled is shown. It is strange because if you make a call, press transfer button, then you can make a new call without problem. Besides you can receive serveral calls and use hold feature without problem. Release 126.96.36.199 is supposed to support multi-call per-line appearance. Is it a bug or normal?
I have done tests and the issue is not associated to a firmware version. I have used serveral firmware for the phone a serveral version for CUCME (8.6 and 9.1). If you try to do a transfer you can make a new call. The issue is only associated to hold feature. I think that the phone by default set the maximun call per line to 1 but there is no way to set this value greater that one. The command "max-calls-per-buttton" has no effect. I have also reproduced the issue using sip firmware.
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...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.