SIP框架

Digest authentication

Supports TCP and UDP protocols

Supports call hold, call waiting, call transfer, call forward, etc.

Support methods: REGISTER, INVITE, OPTIONS, PRACK, ACK, BYE, CANCEL, MESSAGE, SUBSCRIBE, NOTIFY, UPDATE, INFO, REFER, PUBLISH

Create SDP messages

Parse SDP messages

Register

Unregister

Invite to session

Cancel session

End session

Send message

Send info

Update session

Subscribe

Refresh subscription

Notify

Presence

Instant Messaging

Logging