
Microsoft Lync Server 2013 64 Document #: LTRT-40127
Enhanced Gateway with Analog Devices
4.15 Step 15: Miscellaneous Configuration
This step describes miscellaneous configuration actions for the Gateway entity.
4.15.1 Configuring Alternative Routing
When the Enhanced gateway receives a SIP 503 response from the Mediation server in
response to an INVITE, it re-sends the INVITE to the redundant Mediation server (located
at the datacenter). To achieve this, you need to configure the receipt of a SIP 503
response as a reason for IP alternative routing.
To configure alternative routing:
1. Open the Reasons for Alternative Routing page (Configuration tab > VoIP menu >
GW and IP to IP > Routing > Alternative Routing Reasons).
Figure 4-42: Reasons for Alternative Routing Page
2. Under the Tel to IP Reasons group, from the 'Reason 1' drop-down list, select 503.
3. Click Submit.
4. Open the SIP General Parameters page (Configuration tab > VoIP menu > SIP
Definitions > General Parameters).
Figure 4-43: SIP General Parameters Page
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