AudioCodes Mediant 4000 SBC, User Manual

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CHAPTER 56 Enabling Same Call Session ID over Multiple Devices
Mediant 4000 SBC | User's Manual
56 Enabling Same Call Session ID over Multiple
Devices
You can enable the use of a Global Session ID to identify call sessions traversing multiple devices.
The Global Session ID is a randomly assigned ID number that identifies each call session. The ID
is unique to the call session and remains the same throughout the session even if the call traverses
multiple devices.
The Global Session ID appears in SIP messages using the AudioCodes proprietary SIP header,
AC-Session-ID, as shown in the example below:
INVITE sip:2000@172.17.113.123;user=phone SIP/2.0
…
AC-Session-ID: 7f6941530b31d715
…
If the device receives an incoming SIP message containing the Global Session ID, it sends the
same Global Session ID in the outgoing SIP message. If the incoming SIP message does not con-
tain a Global Session ID or if a new session is initiated by the device, the device generates a new,
unique Global Session ID and adds it to the outgoing SIP message.
To enable the Global Session ID, load an ini file to the device with the SendAcSessionIdHeader
parameter configured to 1.
● The Global Session ID is not included in Syslog messages.
● By default, the device does not include the Global Session ID in CDRs. However,
you can customize CDRs to include it. For more information, see Customizing
CDRs for Gateway Calls and
Customizing CDRs for SBC Calls and Test Calls on
page 799.
● If you disable this feature, the device sends outgoing SIP messages without a
Global Session ID (even if a Global Session ID was received in the incoming SIP
message).
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