sip协议中tel 的定义

Question

请问sip协议栈中

From域：
From: <tel:+11111111>;tag=SIPpTag00

tel:+11111111 : 是合法的吗.....

Answer 1

根据 rfc3261 的描述， 这个是不合法的。必须是 ：
============================
The From header field indicates the logical identity of the initiator
   of the request, possibly the user's address-of-record.  Like the To
   header field, it contains a URI and optionally a display name.
============================
url:
http://tools.ietf.org/html/rfc3261
zhu