sip URI与sips URI的区别

The SIP URI follows the same form as an email address: user@domain. There are two
URI schemes:

1〉sip:[email protected] is a SIP URI. This is the most common form and was
introduced in [RFC2543].

2〉sips:[email protected] is a SIPS URI. This new scheme was introduced in
[RFC3261] and requires TLS over TCP as transport for security.

SIPS是使用TLS作为安全传输协议，要求在传输SIP消息前先建立TLS连接