Using pyVoIP as a sip client

[shakeeb80]

I am looking for a SIP client with the following requirements

1. From python I connect to my SIP server
2. To initiate a call,
   a. I want to provide my own offer SDP in the sip invite
   b. I want to get notified when I get the invite response so that I can extract the answer SDP
3. Incoming call
   a. I get notified when i get the invite sot that I can extract the offer SDP
   b. I then want to answer with the answer SDP

Looks like I can directly use the SIPClient in https://github.com/tayler6000/pyVoIP/blob/master/pyVoIP/SIP.py but I would then need to modify the genAnswer() function to take the answer SDP

Question:
Is this something that you add to SIPClient? or alternatively, If I modify SIPClient, would you be open to accept the changes?