<— Received SIP request (485 bytes) from UDP:92.40.169.74:60647 —>

ACK [sip:588@hostname.cable.virginm.net(https://);user=phone SIP/2.0

Via: SIP/2.0/UDP 192.0.0.4:53735;branch=z9hG4bK-524287-1—4e8daaddc563df39;rport

Max-Forwards: 70

To: [sip:588@hostname.cable.virginm.net;user=phone;tag=z9hG4bK-524287-1—4e8daaddc563df39

From: sip:209@hostname.cable.virginm.net:5060;tag=db3125eb

Call-ID: 203875_rel190YWM5N2NmZjU2YzIyNjM2MGMyMTY4ZGQwYTE2MmI2MjI

CSeq: 1 ACK

Content-Length: 0