Lync recognizes Avaya Session Manager as a PSTN gateway connected by SIP. So we need to add Avaya Session Manager to the Lync topology by adding it as a PSTN gateway.
1. To add a PSTN gateway to the Lync topology, run Lync Server Topology Builder as a user in the CSAdministrator group. Then add the Avaya Session Manager to the PSTN gateway topology
Figure 40: Configure PSTN Gateway -1
2. Set FQDN: This is the IP Address or FQDN of the Avaya Session Manager
Figure 41: Configure PSTN Gateway-2
Figure 42: Configure PSTN Gateway -3
3. Set Trunk Name: This is the FQDN of the Avaya Session Manager
4. Set Listening port for IP/PSTN gateway: This Listening port should match the Port setting in the Session Manager’s Entity Link.
5. Set SIP Transport Protocol: TCP
6. Set Associate Mediation Server: Assign this PSTN gateway to the Mediation Server. Medpool.lynclabkm2013.local is used here for example.
Figure 43: Configure PSTN Gateway -4
7. Publish topology to make the changes effective, refer to below scree capture for the process.
Figure 44: Publish Topology