Which three options are valid SIP URI formats? (Choose three.)
A. [email protected]
B. tel:[email protected]
C. phone:[email protected]
D. sip:[email protected]:5060;user=phone
E. sip:bob.cisco.com
Which three options are valid SIP URI formats?
To understand this question, read RFC 3966.
Answer ABD,
“tel” was chosen because it is widely recognized that none of the other suggestions appeared appropriate. “Callto” was discarded because URI schemes locate a resource and do not specify an action to be taken. “Telephone” and “phone” were considered too long and not easily recognized internationally.
I think ADE
Read section 19.1 in RFC3261
Because format with ” phone: ” not using.
https://www.cisco.com/c/en/us/td/docs/routers/7600/install_config/sbc_config_guide_2/sbc-7600-config-guide/sbc_stl.html#wp1008379
ABD
Why B and not C?