Sip Call Flow Example; Figure 9-6: Sip Call Flow - AudioCodes Mediant 2000 User Manual

SIP User's Manual
REGISTER messages are sent to the Registrar's IP address (if configured) or to the Proxy's
IP address. A single message is sent once per device, or messages are sent per B-channel
according to the parameter AuthenticationMode. There is also an option to configure
registration mode per Trunk Group using the TrunkGroupSettings table. The registration
request is resent according to the parameter RegistrationTimeDivider. For example, if
RegistrationTimeDivider = 70 (%) and Registration Expires time = 3600, the device resends
its registration request after 3600 x 70% = 2520 sec. The default value of
RegistrationTimeDivider is 50%.
If registration per B-channel is selected, on device startup the device sends REGISTER
requests according to the maximum number of allowed SIP dialogs (configured by the
parameter NumberOfActiveDialogs). After each received response, the subsequent
REGISTER request is sent.
9.16

SIP Call Flow Example

The SIP call flow (shown in the following figure), describes SIP messages exchanged
between two devices during a simple call. In this call flow example, device (10.8.201.158)
with phone number '6000' dials device (10.8.201.161) with phone number '2000'.
Version 5.8

Figure 9-6: SIP Call Flow

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9. IP Telephony Capabilities
October 2009