Sip read:
REFER sip:2326@172.22.23.1 SIP/2.0
Via: SIP/2.0/UDP 172.22.23.24:5060;branch=z9hG4bK-wx3rzbi0q9c0;rport
From: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
To: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 2 REFER
Max-Forwards: 70
Contact: <sip:2714@172.22.23.24:5060;line=qdgohbzy>
Refer-To: sip:2326@172.22.23.1?Replaces=0da959400bb63f20093027e3569629bc%40172.22.23.1%3Bto-tag%3D
as15dc605a%3Bfrom-tag%3Di6velajlcj
Referred-By: sip:2714@172.22.23.1
User-Agent: snom190-3.56m
Content-Length: 0


SIP/2.0 202 Accepted
Via: SIP/2.0/UDP 172.22.23.24:5060;branch=z9hG4bK-wx3rzbi0q9c0
From: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
To: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 2 REFER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:2326@172.22.23.1>
Content-Length: 0


 to 172.22.23.24:5060
NOTIFY sip:2714@172.22.23.24:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK3d76604b
From: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
Contact: <sip:2326@172.22.23.1>
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX
Event: refer;id=2
Subscription-state: terminated;reason=noresource
Content-Type: message/sipfrag;version=2.0
Content-Length: 14

SIP/2.0 200 OK (no NAT) to 172.22.23.24:5060
BYE sip:2714@172.22.23.24:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK727599fa
From: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
Contact: <sip:2326@172.22.23.1>
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 104 BYE
User-Agent: Asterisk PBX
Content-Length: 0

 (no NAT) to 172.22.23.24:5060
BYE sip:2714@172.22.23.24:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK26d91bb3
From: "2326" <sip:2326@172.22.23.1>;tag=as15dc605a
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=i6velajlcj
Contact: <sip:2326@172.22.23.1>
Call-ID: 0da959400bb63f20093027e3569629bc@172.22.23.1
CSeq: 103 BYE
User-Agent: Asterisk PBX
Content-Length: 0

 (no NAT) to 172.22.23.24:5060

Sip read:
SIP/2.0 200 Ok
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK3d76604b
From: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 103 NOTIFY
Contact: <sip:2714@172.22.23.24:5060;line=qdgohbzy>
Content-Length: 0



Sip read:
BYE sip:2326@172.22.23.1 SIP/2.0
Via: SIP/2.0/UDP 172.22.23.24:5060;branch=z9hG4bK-emqxc3jwdht1;rport
From: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
To: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 3 BYE
Max-Forwards: 70
Contact: <sip:2714@172.22.23.24:5060;line=qdgohbzy>
User-Agent: snom190-3.56m
Content-Length: 0


SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.22.23.24:5060;branch=z9hG4bK-emqxc3jwdht1
From: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
To: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 3 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:2326@172.22.23.1>
Content-Length: 0


 to 172.22.23.24:5060

Sip read:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK727599fa
From: "2326" <sip:2326@172.22.23.1>;tag=as318e5827
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=dsaxdh3ltj
Call-ID: 4333eebf50763a26408326d03f70e73d@172.22.23.1
CSeq: 104 BYE
Contact: <sip:2714@172.22.23.24:5060;line=qdgohbzy>
User-Agent: snom190-3.56m
Content-Length: 0



Sip read:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.22.23.1:5060;branch=z9hG4bK26d91bb3
From: "2326" <sip:2326@172.22.23.1>;tag=as15dc605a
To: <sip:2714@172.22.23.24:5060;line=qdgohbzy>;tag=i6velajlcj
Call-ID: 0da959400bb63f20093027e3569629bc@172.22.23.1
CSeq: 103 BYE
Contact: <sip:2714@172.22.23.24:5060;line=qdgohbzy>
User-Agent: snom190-3.56m
Content-Length: 0



Sip read:
REFER sip:2@172.22.22.1 SIP/2.0
Via: SIP/2.0/UDP 172.22.22.24;branch=z9hG4bKaccErsfzc
From: <sip:2326@172.22.22.24>;tag=1c5553
To: <sip:2@172.22.22.1>;tag=as36fd421c
Call-ID: 205622961629616pwDM-2326--2@172.22.22.24
CSeq: 13563499 REFER
Contact: 2326 <sip:2326@172.22.22.24>
Max-Forwards: 70
Refer-To: sip:2@172.22.22.1?Replaces=240762404624046gqez-2326--2%40172.22.22.24%3Bto-tag%3Das4ec89
6f9%3Bfrom-tag%3D1c31081
Referred-By: sip:2326@172.22.22.24
User-Agent: Audiocodes-Sip-Gateway-MP-108 FXS/v.4.20.354.564
Content-Length: 0


SIP/2.0 202 Accepted
Via: SIP/2.0/UDP 172.22.22.24;branch=z9hG4bKaccErsfzc
From: <sip:2326@172.22.22.24>;tag=1c5553
To: <sip:2@172.22.22.1>;tag=as36fd421c
Call-ID: 205622961629616pwDM-2326--2@172.22.22.24
CSeq: 13563499 REFER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:2@172.22.22.1>
Content-Length: 0


 to 172.22.22.24:5060
NOTIFY sip:2326@172.22.22.24 SIP/2.0
Via: SIP/2.0/UDP 172.22.22.1:5060;branch=z9hG4bK2460b163
From: <sip:2@172.22.22.1>;tag=as36fd421c
To: <sip:2326@172.22.22.24>;tag=1c5553
Contact: <sip:2@172.22.22.1>
Call-ID: 205622961629616pwDM-2326--2@172.22.22.24
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Event: refer;id=13563499
Subscription-state: terminated;reason=noresource
Content-Type: message/sipfrag;version=2.0
Content-Length: 14

SIP/2.0 200 OK (no NAT) to 172.22.22.24:5060
BYE sip:2326@172.22.22.24 SIP/2.0
Via: SIP/2.0/UDP 172.22.22.1:5060;branch=z9hG4bK17010ed7
From: <sip:2@172.22.22.1>;tag=as4ec896f9
To: <sip:2326@172.22.22.24>;tag=1c31081
Contact: <sip:2@172.22.22.1>
Call-ID: 240762404624046gqez-2326--2@172.22.22.24
CSeq: 102 BYE
User-Agent: Asterisk PBX
Content-Length: 0

 (no NAT) to 172.22.22.24:5060
BYE sip:2326@172.22.22.24 SIP/2.0
Via: SIP/2.0/UDP 172.22.22.1:5060;branch=z9hG4bK33c4f994
From: <sip:2@172.22.22.1>;tag=as36fd421c
To: <sip:2326@172.22.22.24>;tag=1c5553
Contact: <sip:2@172.22.22.1>
Call-ID: 205622961629616pwDM-2326--2@172.22.22.24
CSeq: 103 BYE
User-Agent: Asterisk PBX
Content-Length: 0

 (no NAT) to 172.22.22.24:5060