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transfer procedure in sip call of U19XX

Publication Date:  2013-11-25 Views:  77 Downloads:  0
Issue Description
call transfer fail ,the first job is to analyze the transfer procedure .
mobile call A ,A transfer the call to B ,how is the transfer procedure in sip signaling .
Alarm Information
no,
Handling Process
compare the predcure of transfer sip signaling will find out if there is problem in call procedure .
Root Cause
1、when transfer ,U19 will send a invite to B to get the media information .



2、B will take the media which he support in the 200 ok:


3、U19 will tranfer the media to caller  to negotiage the media again :



4、caller will send the media information which negotiage again to U19:


5、U19 send the medai information of caller to B
Suggestions
if a call fail ,we need to analyze the call procedure first .

END