RFC section 10.2.1 says below:

The Contact header field values of the request typically consist of SIP or
SIPS URIs that identify particular SIP endpoints (for example, “
sip:[email protected]”), but they MAY use any URI scheme.* A **SIP
UA can choose to register telephone numbers (with the tel URL, RFC 2806
[8]) or email addresses (with a mailto URL, RFC 2368 [32]) as Contacts for
an address-of-record, for example.*

I would be interested to know the practical use cases where SIP UA would
make use of Tel URL in the Contact header when registering.

Vivek Gupta | Sr. Consultant Engineering
GlobalLogic
P +91.120.406.2953  M +91.987.390.4358  S vivek.gupta_globallogic.com
www.globallogic.com
 <http://www.globallogic.com/>
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