I got a pretty good challenge this week while working on something else. Someone needed to convert a ton of 6945’s to SIP and they don’t have a Communications Manager. I tried to do the conversion with CME…but there are known bugs with that phone and cme. I have found that you have to update the factory default SCCP file…then convert to SIP. What I am working on is getting the proper files and doing the upgrade with just a TFTP server, and no call control component. These phones will be used with a Siemens system utilizing SIP until they get their full Cisco UC solution deployed. I will be posting exact steps once I am successful later. If anybody has any ideas or has done this kind of thing before, any advice would be appreciated.
I have been hammering my studies again in prep for my voice written, which I take exactly one week from today. I have done some serious deep diving on several topics, and wanted to pass some of that information on.
I broke down the different message types for the MGCP protocol, for troubleshooting purposes and have listed them below.
- RQNT = “RequestNotify” sent from CUCM only this is a request to notify usually for on hook.
- NTFY = “Notify” sent from Gateway only this sends the notify to the CUCM that there has been an event (ex: on hook)
- CRCX = “ConnectionRequest” CUCM only this is for a connection setup between 2 endpoints.
- AUEP = “AuditEndpoint” CUCM only sends for status of a registered endpoint.
- AUCX = “AuditConnection” CUCM only gets parameters of a connection
- DLCX = “DeleteConnection” Both Gateway and CUCM sends a delete connection to the other side
- MDCX = “ModifyConnection” CUCM only modifies a connection (usually from recv-only to send-receive for 2 way conversation)
- RSIP = “RestartInProgress” Gateway only sends a RSIP status back to the CUCM if it is in that mode.