if you mean tag= param on the to header, there should be one added automatically as defined in rfc3261.  To send the notify might be a bit trickier, I think we added a way to use an event to send a notify, are you trying to control as iff the user hit the hold button on their phone?  In response to what?

Mike


On Sep 17, 2008, at 7:09 AM, Jon Bruel wrote:

Well, let me be more precise: In general, I want to be able to modify the SIP headers to my liking. I would like to add a tag to the To-header sent to the B-phone. This tag information can be used at a later stage to put the phone on/off hold from the switch by sending a NOTIFY with an header: Event: hold or Event:talk.

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