Issue: PSTN callers experience dropped calls from Meetings, Response groups and transfers.
Environment:
2 Skype for Business Pools - geographically located in different cities.
Pool A is the primary active pool
Pool B is the secondary pool
AudioCodes SBCs running with F5 hardware Load balancing.
When the issues occurs:
when calls travers pool B mediation and then pass through to Pool A FE.
Example 1:
Caller dials Central Number
Caller arrives in Site B SBC
Caller is passed to Mediation pool B
Caller is connected to SfB Front end on Pool A
Caller is handled through a response group and placed into Queue.
Call is answered by first person and then transferred within SfB Pool A
Call is answered by Second person and connected with the Caller.
Approx. 30 seconds after being connected, the caller will be disconnected
Example 2:
Caller dials into a SfB meeting via PSTN, but connects through Pool B SBC
Call is passed from Pool B Mediation pool to Pool A Front End
Caller will remain connected to the meeting for exactly 15 minutes and then be dropped(their chat and screen share will remain in tact)
Hypothesis is that traffic being routed through Pool B Mediation is creating a failure when the call is connected to Pool A Topology.
Questions:
1. Should we change the routing in the SBC to connect directly to Pool A, unless it is unavailable and then direct to Pool B?
2. Is there another reason for the drop? Mediation configuration is incorrect?
NOTE: two specific errors occur and only occur when calls pass through pool B: 52112 and 10408