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SRVCC (Single Radio Voice Call Continuity) provides the ability to transition a voice call from the VoIP/IMS packet domain (LTE) to the legacy circuit domain. Variations of SRVCC are being standardized to support both GSM/UMTS and CDMA 1x circuit domains. For an operator with a legacy cellular network who wishes to deploy IMS/VoIP-based voice services in conjunction with the rollout of an LTE network, SRVCC offers VoIP subscribers with coverage over a much larger area than would typically be available during the rollout of a new network.

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On SBC main screen, go to All > Global >  Signaling > Srvcc. The Srvcc window is displayed.

Caption
0Figure
1Srvcc

Image Modified 

The following fields are displayed:

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0Table
1Srvcc Parameters
ParameterDefault ValueDescription
Stn SrNULLRequest URI for a transfer call sent by MSC on PS to CS call handoff.
E Stn SrNULLRequest URI for a emergency transfer call sent by MSC on PS to CS call handoff.
Atcf URINULL

SIP URI to be used as the ATCF Path and Management URI

Pstops Sti
NULL

Request URI (0-32 characters) for a PS to PS optimized handover call. The allowed character set is:

  • Alphabets(upper- and lower-case)
  • Numbers (0-9)
  • Any of the following special characters:
    • +
    • -
    • .
    • (
    • )

For example, +1-pstopsSti-222 is a valid value for this field.

Call Linger Timer8Number of seconds to wait for INVITE due to STN_SR before clearing the call.

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