SIP Headers

1
SIP Headers

• Via contains the address at which the originator
  is expecting to receive responses to this
  request. Mandatory
• To contains a display name and a SIP URI towards
  which the request was originally directed.
  Mandatory
• Display names are described in RFC 2822
• From also contains a display name and a SIP URI
  that indicate the originator of the request. The
  From also contains a tag parameter which is used
  for identification purposes. Mandatory
• Call-ID contains a globally unique identifier for
  this call. Mandatory
• CSeq or Command Sequence contains an integer and
  a method name. The CSeq number is incremented for
  each new request within a dialog and is a
  traditional sequence number. Mandatory
• Contact contains a SIP URI that represents a
  direct route to the originator usually composed
  of a username at a fully qualified domain name
  (FQDN). While an FQDN is preferred, many end
  systems do not have registered domain names, so
  IP addresses are permitted. The Contact header
  field tells other elements where to send future
  requests.
• Max-Forwards serves to limit the number of hops a
  request can make on the way to its destination.
  It consists of an integer that is decremented by
  one at each hop.
• Content-Type contains a description of the
  message body. Mandatory
• Content-Length contains an octet (byte) count of
  the message body.

2
SDP Messages
Session description v (protocol version)
Mandatory o (owner/creator and session
identifier). Mandatory s (session name)
Mandatory t (time the session is active)
Mandatory i (session information) u
(URI of description) e (email address)
p (phone number) c (connection
information - not required if included in all
media) b (bandwidth information) z
(time zone adjustments) k (encryption
key) a (zero or more session attribute
lines) r (zero or more repeat times)Media
description m (media name and transport
address) Mandatory i (media title) c
(connection information - optional if included at
session-level) b (bandwidth
information) a (zero or more media
attribute lines)
3
Normal SIP Invite
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
4
Breakdown of the Invite Message INVITE Request
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Called Number
Destination (Qwest) IP Signaling Address
Request Method
5
Breakdown of the Invite Message Via Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Signaling Port Number of the Source IP Address

Source IP Address
The Via Header is used for translation rules and
Session Agent matches.
Via Header This is a Mandatory Header
6
Breakdown of the Invite Message From Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
From Address This is used to make a match in the
Local-Policy.
Maps to the ISUP Generic Name

Maps to the ISUP Calling Party Number
From Header This is a Mandatory Header
7
Breakdown of the Invite Message To Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Destination Number
Destination (Qwest) IP Signaling Address

To Header This is a Mandatory Header
8
Breakdown of the Invite Message Contact Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Contact Address This is used to send the reply
back to the sender.

Contact Header
9
Breakdown of the Invite Message Call-ID Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Call-ID Header This is a Mandatory Header

10
Breakdown of the Invite Message CSeq Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Command Sequence Header This is a Mandatory Header
11
Breakdown of the Invite Message User-Agent
Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

User-Agent Header
12
Breakdown of the Invite Message Date Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Date Header
13
Breakdown of the Invite Message Allow Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Allow Header
14
Breakdown of the Invite Message Content-Type
Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Content-Type Header This is a Mandatory Header
15
Breakdown of the Invite Message Content-Length
Header
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Content-Length Header
16
Breakdown of the Invite Message SDP Messages
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
This is the SDP information within the Invite

17
Breakdown of the Invite Message SDP Messages
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Protocol Version Mandatory
Owner Mandatory

Session Name Mandatory
IP address for RTP
Time the session is active Mandatory
18
Breakdown of the Invite Message SDP Media
Message
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -
Port for RTP
mMedia Name Mandatory

101 Telephone Event 18 G.729 8 G.711 ALaw 0
G.711 MuLaw
19
Breakdown of the Invite Message SDP Media
Attributes
INVITE sip01150259917040_at_67.135.76.4
SIP/2.0 Via SIP/2.0/UDP 69.7.163.1545060branch
z9hG4bK400fc6e6 From "8069664170"
ltsip8069664170_at_69.7.163.154gttagas42e2ecf6 To
ltsip01150259917040_at_67.135.76.4gt Contact
ltsip8069664170_at_69.7.163.154gt Call-ID
2485823e63b290b47c042f20764d990a_at_69.7.163.154 CSeq
102 INVITE User-Agent MatrixSwitch Date Thu,
22 Dec 2005 183828 GMT Allow INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER Content-Type
application/sdp Content-Length 268 v0 oroot
14040 14040 IN IP4 69.7.163.154 ssession cIN
IP4 69.7.163.154 t0 0 maudio 26784 RTP/AVP 0 8
18 101 artpmap0 PCMU/8000 artpmap8
PCMA/8000 artpmap18 G729/8000 artpmap101
telephone-event/8000 afmtp101 0-16 afmtp18
annexbno - - - -

Codecs 18 G.729 8 G.711 ALaw 0 G.711 MuLaw
DTMF via RFC 2833 is shown as a Telephone Event
(101) with values 0-16
This is how G.729A (without silence suppression)
is designated
20
How does the SIP Invite Map to an IAM?
INVITE sip2127568000_at_67.130.192.65060
SIP/2.0 f"Kevin Hyden"ltsip6142591566_at_67.130.192.
65060gttag6ac1e3a4aa1f4e549ab21eaea153ed20 mltsi
p0-c0a8c94b13c419202d5d_at_67.133.234.1615060trans
portudpgt tltsip2127568000_at_67.130.192.65060gt i6
37cdd3676311d35ff614f78593a2e44-43ba8a9c_at_67.133.23
4.161 CSeq31810 INVITE vSIP/2.0/UDP
67.133.234.1615060branchz9hG4bK1e891a7df195a14c
cd9df344e4583880-0 Max-Forwards70 AllowINVITE,BY
E,ACK,CANCEL,PRACK,REFER,OPTIONS,REGISTER,NOTIFY c
application/sdp Remote-Party-ID
ltsip6142591566_at_192.168.201.23gtpartycallingid-t
ypesubscriberprivacyoff Anonymity
uri Proxy-Requireprivacy l124 v0 o- 256000
25600000 IN IP4 67.133.234.141 s- cIN IP4
67.133.234.141 t0 0 maudio 48744 RTP/AVP 0
8 aptime20
Called Number
Generic Name
Calling Party Number
DOES NOT MAP TO CHARGE NUMBER (CGN)
21
Example of an Invite With Caller ID Blocked
INVITE sip2128507797_at_67.130.192.65060
SIP/2.0 fAnonymous ltsipPrivateNumber_at_localhost1gt
tag38fb29dc743e09a87fa0f40ce1e92906 tltsip21285
07797_at_localhost2gt i3dd342b75e489191fc70a4d658ded8
35-43ba8cf2_at_67.133.234.161 CSeq19718
INVITE vSIP/2.0/UDP 67.133.234.1615060branchz9
hG4bK844bec9bcb061c035deaefe92fe1007e-0 Max-Forwar
ds70 AllowINVITE,BYE,ACK,CANCEL,PRACK,REFER,OPTI
ONS,REGISTER,NOTIFY capplication/sdp Remote-Party
-ID ltsip6099448955_at_192.168.201.25gtpartycalling
id-typesubscriberprivacyfull P-Asserted-Identi
ty sip6099448955_at_192.168.201.25 Privacy id
user Anonymity uri Proxy-Requireprivacy mlts
ip0-c0a8c94b13c419202d5d_at_67.133.234.1615060tran
sportudpgt l124 v0 o- 108600 10860000 IN IP4
67.133.234.140 s- cIN IP4 67.133.234.140 t0
0 maudio 53016 RTP/AVP 0 8 aptime20
Called Number
Generic Name
No Calling Party Number will be present in the
ISUP IAM
DOES NOT MAP TO CHARGE NUMBER (CGN)
22
Example of G.711
INVITE sip2125332600_at_67.130.192.65060
SIP/2.0 f"Kevin Hyden"ltsip6142591566_at_67.130.192.
65060gttagf0af9415bfb610da4ba208f2cf39fe8e mltsi
p0-c0a8c94a13c419202d5d_at_67.133.234.1615060trans
portudpgt tltsip2125332600_at_67.130.192.65060gt i9
a22036f405d74b3853c437f3f3a598f-43ba8745_at_67.133.23
4.161 CSeq45023 INVITE vSIP/2.0/UDP
67.133.234.1615060branchz9hG4bKcee1d96ac551c44b
c1efe13065f6ff3a-0 Max-Forwards70 AllowINVITE,BY
E,ACK,CANCEL,PRACK,REFER,OPTIONS,REGISTER,NOTIFY c
application/sdp Remote-Party-ID
ltsip6142591566_at_192.168.201.23gtpartycallingid-t
ypesubscriberprivacyoff Anonymity
uri Proxy-Requireprivacy l124 v0 o- 132000
13200000 IN IP4 67.133.234.140 s- cIN IP4
67.133.234.140 t0 0 maudio 40294 RTP/AVP 0
8 aptime20
G.711 a-Law (PCMU)
G.711 Mu-Law (PCMU)
Packet Size (this not codec dependent) Note that
the Packet Size is not always specified, and is
defaulted to 20ms unless otherwise noted.