User's Manual
202
Document #: LTRT-10375
Mediant 500 MSBR
The device initiates a recording session by sending an INVITE message to the SRS when
the recorded call is connected. The SIP From header contains the identity of the SRC and
the To header contains the identity of the SRS. The SDP in the INVITE contains:
Two 'm=' lines that represent the two RTP/SRTP streams (Rx and Tx).
Two 'a=label:' lines that identify the streams.
XML body (also referred to as metadata) that provides information on the participants
of the call session:
•
<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:[email protected] 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:[email protected]>
Call-ID: [email protected]
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
Содержание Mediant 500 MSBR
Страница 1: ...User s Manual AudioCodes Family of Multi Service Business Routers MSBR Mediant 500 MSBR Version 7 2 ...
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Страница 33: ...Part I Getting Started with Initial Connectivity ...
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Страница 45: ...Part II Management Tools ...
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Страница 115: ...Part III General System Settings ...
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Страница 137: ...Part IV General VoIP Configuration ...
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Страница 455: ...Part V Gateway Application ...
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Страница 458: ...User s Manual 458 Document LTRT 10375 Mediant 500 MSBR IP to Tel Call Figure 24 1 IP to Tel Call Processing Flowchart ...
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Страница 751: ...Part VIII Data Router Configuration ...
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Страница 837: ...Part X Status Performance Monitoring and Reporting ...
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Страница 927: ...Part XI Diagnostics ...
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Страница 977: ...Part XII Appendix ...
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