[Asterisk-Users] Empty ACK

[Ronald Voermans]

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?

Regards,

Ronald