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SIP SUBCRIBE and dialog-info messages

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SIP SUBCRIBE and dialog-info messages
Answer
10/29/09 7:44 PM
I am working with some third party SIP phones and have a few questions.  I am trying to get shared lines functional across these devices.
 
They support the dialog-info+xml messages that are required for bridged line appearances.
 
My only problem is that I cannot get CUCM to send a subscribe to these devices to start the dialog process.
 
Anyone have any ideas?
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RE: SIP SUBCRIBE and dialog-info messages
Answer
6/22/10 11:01 PM as a reply to Philip s Walenta.
The UCM shared-line implementation for SIP uses some proprietary SIP extensions that Cisco developed.  Access-to/usage of these extensions requires a special licensing agreement with Cisco IPCBU.  UCM does not attempt to use (or respond to) the extensions when interacting with the built-in 'standard' 3rd party SIP device types.  A SIP-extensions licensed 3rd party device will have a custom device-type installer (a Cisco Options Package, .cop, file) which will create a new device on UCM (which can then use SIP extensions.)
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