[Asterisk-Users] Empty ACK

[Olle E. Johansson]

Ronald Voermans wrote:
> Hello,
> 
> I have asterisk connected to SER/RTPProxy which is again connected to a
> IP-PSTN gateway. When calling with a UA, registered at * to a SIP phone
> connected to the IP-PSTN gateway, I get 'empty ACKs':
> 
> U 192.168.0.173:5060 -> 10.254.254.1:5060 ACK  SIP/2.0.
> Via: SIP/2.0/UDP 192.168.0.173:5060;branch=z9hG4bK5cb7d048.
> Route: <sip:0161801019 at 10.166.38.108:5060>,<sip:212.241.48.70:5060>.
> From: "0161801019" <sip:0161801019 at 192.168.0.173>;tag=as628d39c1.
> To: <sip:0388804318 at 10.254.254.1>;tag=00-04094-52dc5953-7c1293c27.
> Contact: <sip:0161801019 at 192.168.0.173>.
> Call-ID: 0d4906697d327f206cde12a5030d8d17 at 192.168.0.173.
> CSeq: 103 ACK.
> User-Agent: Asterisk PBX.
> Content-Length: 0.
> 
> As you can see, there is no URI after the ACK statement, and SER doesn't
> know what to do with it. Is this a bug in *, or is this normal?
> 
It certainly looks odd. But you have to give us more information.
Which version of Asterisk?

Please also include a full SIP debug with debug level 4, verbose level 4
of the whole transaction, from the first INVITE to this weird ack.

Add that to a bug report in the bug tracker, and we'll take a look at
it. We should not send packets like this.


/O