REFER message and Trunk Configuration

Voice & Telephony
1

Hi All,

I am going through Genesys SIP Server features and am confused with the below scenario.
Feature name: Call Transfer and Conference
Sub-Topic: Routing to External Destination Using REFER—Inbound Calls.

Below is my call scenario:

  1. New Customer call request is sent to SBC.
  2. SBC sends a INVITE request to SIP Server via INBOUND TRUNK-DN.
  3. After applying some inter dial plan rules a Routing strategy is triggered.
  4. Then call gets routed to Agent.
  5. Now agent transfers an inbound call by using the single-step transfer to a Routing Point, then the call is routed to an external destination.
  6. The call path involves routepoint->OUTBOUND TRUNK-DN->SBC->Serviceprobvider-> External destination.

It is given in the deployment guide we need to configure the Trunk DN for inbound calls to Enabling Inbound External Routing by REFER.
configure the following options in the TServer section:
• oosp-transfer-enabled—Set this to true.
• refer-enabled—Set this to false.
This ensures the REFER for this Trunk DN is
used only in OOSP (single-step transfer)
scenarios.

My question now is this configuration should be performed on INBOUND TRUNK-DN or OUTBOUND TRUNK-DN in the above scenario.

Thanks in Advance.

2

The configuration should be on both trunks

3

Thank you for your reply. Please Consider Inbound SBC is different from outbound SBC. Once the call is answered by Agent our INBOUND TRUNK-DN is out of flow. May I know why it is required on both trunk DNs?

4

Because all involved parties should use the same method (RE-INVITE or REFER) as is mentioned within the guide and it makes sense.

5

I would say that it is not that black and white @Kubig given that we are talking about different SBCs between the endpoints in this scenario and hence there might be good reason for one of the SBCs to stay in the signalling path.

6

Yes, you are absolutely right. My answer was related to origin question, where the complete OOSP was needed.