SIP FAQ : SIP Protocol Operation : What's the difference between the request URIs tel:+12125551212 and sip:12125551212@gw.com?
	Non-SIP URLs, such as tel:+12125551212 for a telephone number, may be used as request URIs in SIP INVITE requests. This only makes sense if all outbound calls are handled by a proxy server. In the case of a tel: URL, the proxy server would then translate the request URL to a SIP URL of a gateway server, if it is not handling the gateway duty itself. The proxy server might use the Telephony Routing over IP protocol (TRIP) to find the appropriate next-hop SIP server. The To header may always be a tel: URL even if the Request-URI is a SIP URL, although that breaks with the common practice that Request-URI and To start out the same.
	[Append to This Answer]
	islepchin@dynamicsoft.com
	2000-Jul-03 9:14pm

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