Call may be wrongly hung up if UPDATE is sent to lock codec during early media (thanks Bogdan Krakowski for the report)

[bennylp]

Call may be hung up by PJSIP on the following scenario:

 (1) INVITE (sdp) ----->
 (2)              <-----  183 Progress (sdp with multiple codec list)
 (3)       UPDATE ----->
 (4)              <-----  200 OK/INVITE
 (5)          ACK ----->

With the above scenario, PJSIP will send BYE after step 5 because it detects that an SDP offer-answer is still in progress when call is answered, even though in this case the initial offer-answer (the one with INVITE) has actually completed and the pending offer-answer is the updated one.