Send/Receive message during call

[mgsray]

Guys,
I have a requirement to receive/send message from/to sip server during sip call. The message is text base, can be treated as notification.
Currently, I use sipuseragent, it works on the call part. What should I do to realize the message function?

[sipsorcery]

There is no feature that will let you send arbitrary in dialog SIP requests, which I think is what you're asking. The closest is the on/off hold reINVITE requests.

You could use that method as a starting point and change the request type to MESSAGE, or whatever you require, and it should work.