#
U A.A.A.A:6076 -> B.B.B.B:5060
INVITE sip:17145551212@sip.domain.com SIP/2.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;branch=z9hG4bK1558238633;rport.
Route: <sip:registrar.domain.com:5060;lr>.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Contact: "XXXX" <sip:12565551212@10.59.1.252:6076>.
Proxy-Authorization: Digest username="8732501", realm="sip.domain.com", nonce="UD+hHVA/n/G8Il+22Uyk4vM/lmZe6yYX", uri="sip:17145551212@sip.domain.com", response="66b283b3a04fee8f86736e1a0a9d8af8", algorithm=MD5.
Max-Forwards: 70.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Privacy: none.
P-Preferred-Identity: "XXXX" <sip:12565551212@sip.domain.com>.
Supported: replaces, path, timer, eventlist.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Type: application/sdp.
Accept: application/sdp, application/dtmf-relay.
Content-Length:   272.
.
v=0.
o=12565551212 8006 8000 IN IP4 10.59.1.252.
s=SIP Call.
c=IN IP4 10.59.1.252.
t=0 0.
m=audio 6016 RTP/AVP 0 18 101.
a=sendrecv.
a=rtpmap:0 PCMU/8000.
a=ptime:20.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16,32-36,54.

#
U B.B.B.B:5060 -> A.A.A.A:6076
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 10.59.1.252:6076;branch=z9hG4bK1558238633;rport=6076;received=A.A.A.A.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Server: 5Nine SIP Registrar.
Content-Length: 0.
.

#
U B.B.B.B:5060 -> C.C.C.C:5060
INVITE sip:17145551212@sip.domain.com SIP/2.0.
Record-Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bKa1fc.0aef54e32b5ef02112bd962127d604fc.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;received=A.A.A.A;branch=z9hG4bK1558238633;rport=6076.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Contact: "XXXX" <sip:12565551212@A.A.A.A:6076>.
Proxy-Authorization: Digest username="8732501", realm="sip.domain.com", nonce="UD+hHVA/n/G8Il+22Uyk4vM/lmZe6yYX", uri="sip:17145551212@sip.domain.com", response="66b283b3a04fee8f86736e1a0a9d8af8", algorithm=MD5.
Max-Forwards: 69.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Privacy: none.
P-Preferred-Identity: "XXXX" <sip:12565551212@sip.domain.com>.
Supported: replaces, path, timer, eventlist.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Type: application/sdp.
Accept: application/sdp, application/dtmf-relay.
Content-Length:   295.
.
v=0.
o=12565551212 8006 8000 IN IP4 B.B.B.B.
s=SIP Call.
c=IN IP4 B.B.B.B.
t=0 0.
m=audio 47788 RTP/AVP 0 18 101.
a=sendrecv.
a=rtpmap:0 PCMU/8000.
a=ptime:20.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16,32-3
#
U C.C.C.C:5060 -> B.B.B.B:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bKa1fc.0aef54e32b5ef02112bd962127d604fc.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;received=A.A.A.A;branch=z9hG4bK1558238633;rport=6076.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Server: 5Nine SIP Server.
Content-Length: 0.
.

#
U C.C.C.C:5060 -> B.B.B.B:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bKa1fc.0aef54e32b5ef02112bd962127d604fc.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;received=A.A.A.A;branch=z9hG4bK1558238633;rport=6076.
Record-Route: <sip:C.C.C.C;lr;ftag=882659929>.
Record-Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Contact: <sip:17145551212@C.C.C.C:6036;transport=udp>.
User-Agent: 5Nine SIP UA.
Accept: application/sdp.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
Supported: precondition, path, replaces.
Allow-Events: talk, hold, refer.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 257.
P-Asserted-Identity: "1-714-555-1212" <sip:17145551212@sip.domain.com>.
.
v=0.
o=5Nine_Fax_UA 1346315523 1346315524 IN IP4 D.D.D.D.
s=5Nine_Fax_UA.
c=IN IP4 D.D.D.D.
t=0 0.
m=audio 31472 RTP/AVP 0 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.

#
U B.B.B.B:5060 -> A.A.A.A:6076
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 10.59.1.252:6076;received=A.A.A.A;branch=z9hG4bK1558238633;rport=6076.
Record-Route: <sip:C.C.C.C;lr;ftag=882659929>.
Record-Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 INVITE.
Contact: <sip:17145551212@C.C.C.C:6036;transport=udp>.
User-Agent: 5Nine SIP UA.
Accept: application/sdp.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
Supported: precondition, path, replaces.
Allow-Events: talk, hold, refer.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 271.
P-Asserted-Identity: "1-714-555-1212" <sip:17145551212@sip.domain.com>.
.
v=0.
o=5Nine_Fax_UA 1346315523 1346315524 IN IP4 B.B.B.B.
s=5Nine_Fax_UA.
c=IN IP4 B.B.B.B.
t=0 0.
m=audio 41458 RTP/AVP 0 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.
a=nortpproxy:yes.

#
U A.A.A.A:6076 -> B.B.B.B:5060
ACK sip:17145551212@C.C.C.C:6036;transport=udp SIP/2.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;branch=z9hG4bK731990538;rport.
Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
Route: <sip:C.C.C.C;lr;ftag=882659929>.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 ACK.
Contact: <sip:12565551212@10.59.1.252:6076>.
Proxy-Authorization: Digest username="8732501", realm="sip.domain.com", nonce="UD+hHVA/n/G8Il+22Uyk4vM/lmZe6yYX", uri="sip:17145551212@sip.domain.com", response="66b283b3a04fee8f86736e1a0a9d8af8", algorithm=MD5.
Max-Forwards: 70.
Supported: replaces, path, timer, eventlist.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Length: 0.
.

#
U B.B.B.B:5060 -> C.C.C.C:5060
ACK sip:17145551212@C.C.C.C:6036;transport=udp SIP/2.0.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bKa1fc.7635be006561424e631b974c9641dce7.0.
Via: SIP/2.0/UDP 10.59.1.252:6076;received=A.A.A.A;branch=z9hG4bK731990538;rport=6076.
Route: <sip:C.C.C.C;lr;ftag=882659929>.
From: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
To: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 21 ACK.
Contact: <sip:12565551212@A.A.A.A:6076>.
Proxy-Authorization: Digest username="8732501", realm="sip.domain.com", nonce="UD+hHVA/n/G8Il+22Uyk4vM/lmZe6yYX", uri="sip:17145551212@sip.domain.com", response="66b283b3a04fee8f86736e1a0a9d8af8", algorithm=MD5.
Max-Forwards: 69.
Supported: replaces, path, timer, eventlist.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Length: 0.
.

#
U C.C.C.C:5060 -> B.B.B.B:5060
INVITE sip:12565551212@A.A.A.A:6076 SIP/2.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
Max-Forwards: 69.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Contact: <sip:17145551212@C.C.C.C:6036;transport=udp>.
User-Agent: 5Nine SIP UA.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
Supported: precondition, path, replaces.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 326.
X-FS-Support: update_display,send_info.
.
v=0.
o=5Nine_Fax_UA 1346315523 1346315525 IN IP4 D.D.D.D.
s=5Nine_Fax_UA.
c=IN IP4 D.D.D.D.
t=0 0.
m=image 31472 udptl t38.
a=T38FaxVersion:0.
a=T38MaxBitRate:14400.
a=T38FaxFillBitRemoval.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxMaxBuffer:2000.
a=T38FaxMaxDatagram:400.
a=T38FaxUdpEC:t38UDPRedundancy.

#
U B.B.B.B:5060 -> C.C.C.C:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Server: 5Nine SIP Registrar.
Content-Length: 0.
.

#
U B.B.B.B:5060 -> A.A.A.A:6076
INVITE sip:12565551212@A.A.A.A:6076 SIP/2.0.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bK01ee.4dc5bfe0ed409aeb5f48d0f0c2254cb9.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
Max-Forwards: 69.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Contact: <sip:17145551212@C.C.C.C:6036;transport=udp>.
User-Agent: 5Nine SIP UA.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
Supported: precondition, path, replaces.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 340.
X-FS-Support: update_display,send_info.
.
v=0.
o=5Nine_Fax_UA 1346315523 1346315525 IN IP4 B.B.B.B.
s=5Nine_Fax_UA.
c=IN IP4 B.B.B.B.
t=0 0.
m=image 41458 udptl t38.
a=T38FaxVersion:0.
a=T38MaxBitRate:14400.
a=T38FaxFillBitRemoval.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxMaxBuffer:2000.
a=T38FaxMaxDatagram:400.
a=T38FaxUdpEC:t38UDPRedundancy.
a=nortpproxy:yes.

#
U A.A.A.A:6076 -> B.B.B.B:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bK01ee.4dc5bfe0ed409aeb5f48d0f0c2254cb9.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Contact: <sip:12565551212@10.59.1.252:6076>.
Supported: replaces, path, timer, eventlist.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Length: 0.
.

#
U A.A.A.A:6076 -> B.B.B.B:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bK01ee.4dc5bfe0ed409aeb5f48d0f0c2254cb9.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Contact: <sip:12565551212@10.59.1.252:6076>.
Supported: replaces, path, timer, eventlist.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Type: application/sdp.
Content-Length:   276.
.
v=0.
o=12565551212 8006 8001 IN IP4 10.59.1.252.
s=SIP Call.
c=IN IP4 10.59.1.252.
t=0 0.
m=image 6016 udptl t38.
a=T38FaxVersion:0.
a=T38MaxBitRate:14400.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxMaxBuffer:2000.
a=T38FaxMaxDatagram:400.
a=T38FaxUdpEC:t38UDPRedundancy.

#
U B.B.B.B:5060 -> C.C.C.C:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.8bcdbd9a34055b4c29e228d21b253042.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKH4K8a425ayFtg.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 INVITE.
Contact: <sip:12565551212@A.A.A.A:6076>.
Supported: replaces, path, timer, eventlist.
User-Agent: Grandstream GXW-4004  V1.5A 1.0.6.13  chip V2.2.
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE.
Content-Type: application/sdp.
Content-Length:   276.
.
v=0.
o=12565551212 8006 8001 IN IP4 10.59.1.252.
s=SIP Call.
c=IN IP4 10.59.1.252.
t=0 0.
m=image 6016 udptl t38.
a=T38FaxVersion:0.
a=T38MaxBitRate:14400.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxMaxBuffer:2000.
a=T38FaxMaxDatagram:400.
a=T38FaxUdpEC:t38UDPRedundancy.

#
U C.C.C.C:5060 -> B.B.B.B:5060
ACK sip:12565551212@A.A.A.A:6076 SIP/2.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.1315bc3367d9fc99f00fb42d46025603.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKjDD1cZK9765cc.
Route: <sip:B.B.B.B;lr;ftag=882659929;nat=yes>.
Max-Forwards: 70.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 ACK.
Content-Length: 0.
.

#
U B.B.B.B:5060 -> A.A.A.A:6076
ACK sip:12565551212@A.A.A.A:6076 SIP/2.0.
Via: SIP/2.0/UDP B.B.B.B;branch=z9hG4bK01ee.69fc0d41b5029000def19725964bc247.0.
Via: SIP/2.0/UDP C.C.C.C;branch=z9hG4bK01ee.1315bc3367d9fc99f00fb42d46025603.0.
Via: SIP/2.0/UDP C.C.C.C:6036;rport=6036;branch=z9hG4bKjDD1cZK9765cc.
Max-Forwards: 70.
From: <sip:17145551212@sip.domain.com>;tag=U1t161eBSrS2g.
To: "XXXX" <sip:12565551212@sip.domain.com>;tag=882659929.
Call-ID: 1764337442-6076-2@BA.FJ.B.CFC.
CSeq: 32837434 ACK.
Content-Length: 0.
.