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User=phone parameter in SIP means that the userpart of a SIP URI is a valid RFC2806bis tel: URI
tel: URI can be a global number, or a local number with phone-context:
tel:1234;phone-context=example.com
some devices are really stupid and need a proxy to translate dial strings for them. the proxy needs to know if it should do digit map translation when it gets a request
We agree: continued
PPT Version