AudioCodes Mediant 800B User Manual page 240

•
<group id>: Logging Session ID (displayed as [SID:nnnnn] in Syslog), converted
from decimal to hex. This number remains the same even if the call is forwarded
or transferred. This is important for recorded calls.
•
<session id>: Originally recorded Call-ID, converted from decimal to hex.
•
<group-ref>: same as <group id>.
•
<participant id>: SIP From / To user.
•
<nameID aor>: From/To user@host.
•
<send> and <recv>: ID's for the RTP/SRTP streams in hex - bits 0-31 are the
same as group, bits 32-47 are the RTP port.
•
<stream id>: Same as <send> for each participant.
•
<label>: 1 and 2 (same as in the SDP's 'a=label:' line).
The SRS can respond with 'a=recvonly' for immediate recording or 'a=inactive' if recording
is not yet needed, and send re-INVITE at any later time with the desired RTP/SRTP mode
change. If a re-INVITE is received in the original call (e.g. when a call is on hold), the
device sends another re-INVITE with two 'm=' lines to the SRS with the updated
RTP/SRTP data. If the recorded leg uses SRTP, the device can send the media streams to
the SRS as SRTP; otherwise, the media streams are sent as RTP to the SRS.
Below is an example of an INVITE sent by the device to an SRS:
INVITE sip:VSRP@1.9.64.253 SIP/2.0
Via: SIP/2.0/UDP 192.168.241.44:5060;branch=z9hG4bKac505782914
Max-Forwards: 10
From: <sip:192.168.241.44>;tag=1c505764207
To: <sip:VSRP@1.9.64.253>
Call-ID: 505763097241201011157@192.168.241.44
CSeq: 1 INVITE
Contact: <sip:192.168.241.44:5060>;src
Supported: replaces,resource-priority
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUB
SCRIBE,UPDATE
Require: siprec
User-Agent: Mediant /v.7.20A.000.038
Content-Type: multipart/mixed;boundary=boundary_ac1fffff85b
Content-Length: 1832
--boundary_ac1fffff85b
Content-Type: application/sdp
v=0
o=AudiocodesGW 921244928 921244893 IN IP4 10.33.8.70
s=SBC-Call
c=IN IP4 10.33.8.70
t=0 0
m=audio 6020 RTP/AVP 8 96
c=IN IP4 10.33.8.70
a=ptime:20
a=sendonly
a=label:1
a=rtpmap:8 PCMA/8000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
m=audio 6030 RTP/AVP 8 96
c=IN IP4 10.33.8.70
a=ptime:20
a=sendonly
a=label:2
a=rtpmap:8 PCMA/8000
User's Manual
Mediant 800B Gateway & E-SBC
240 Document #: LTRT-10632