Hi,
I have the following scenario intermittently:
PBX SBC Service
Provider
---INVITE--->
<---100 Trying---
---INVITE--->
<---100 Trying---
<---183 Session Progress---
<---183 Session Progress---
---PRACK--->
---PRACK--->
<---200OK---
<---183 Session Progress---
<---183 Session Progress---
<---504 Server Timeout---
---ACK--->
The service provider is stating they the SBC should send a PRACK for every 183
sent, which I believe is correct however RFC3262 states "a UAC SHOULD NOT
retransmit the PRACK request when it receives a retransmission of the
provisional response being acknowledged"
As far as I am concerned the PRACK is not being received by the Service
provider so they re-transmit the 183, which should be PRACK'd to stop
re-transmissions of the 183, but the RFC contradicts this
What should be happening here is the SBC at fault?
Regards
Jason
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