[asterisk-users] SDP bug

[kjcsb]

>> The call that gets dropped had a retransmission of INVITE from UAC  
>> to UAS (and therefore retransmission of 200 OK from UAS to UAC).  
>> There is nothing wrong with the re-transmission as such, but I  
>> noticed a potential bug in Asterisk in the way it responds to an  
>> INVITE retransmission. Asterisk is bumping up the session version  
>> number in the retransmitted 200 OK's SDP. This is as if Asterisk is  
>> treating the INVITE retransmission as a RE-INVITE.
>>
>> Asterisk sends 200 OK:
>> o=root 16300 16300 IN IP4 203.89.nnn.nnn
>>
>> Asterisk sends 200 OK (retransmission):
>> o=root 16300 16301 IN IP4 203.89.nnn.nnn
>>
>> Ideally, this bug should have nothing to do with why Asterisk is  
>> ignoring the ACK (which is why it keeps reatrasmitting the 200 OK  
>> and eventually drops the call). However, if you can confirm that  
>> all dropped calls have INVITE retransmission then that might give  
>> us a clue?
>
>Raj,
>That's an interesting observation. Do you think this will cause any  
>issues? Even though it's not
>beautiful, I fail to see why a UA would check that.

I have run a number of tests and in all cases the calls that fail have a retransmitted INVITE whereas the successfull calls have only one INVITE.

Regards

Cameron


		
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