PAETEC and Microsoft Lync Integration 68  Document #: LTRT-33420 
  Mediant 800/1000/3000 E-SBC 
¾  To define SIP Reason for Alternative Routing: 
1.  Open the 'Reasons for Alternative Routing' page (Configuration tab > VoIP menu 
> GW and IP to IP > Routing submenu > Alternative Routing Reasons). 
Figure  5-32: Reasons for Alternative Routing Page 
 
2.  Under the Tel to IP Reasons group, for Reason 1, select ‘503’. 
3.  Click Submit. 
4.  Open the ‘Proxy & Registration’ page (Configuration > VoIP > SIP Definitions > 
Proxy & Registration) and configure the ‘Redundant Routing Mode’ parameter 
to ‘Proxy’ as shown below in Figure 
 5-33. This will allow entry back into the Proxy 
Set table for the next available route. This redundant route is configured in the 
next step (on Proxy Set ID 2, see Figure 
 5-34 below). 
5.  Open the 'Proxy Sets Table' page (Configuration tab > VoIP menu > Control 
Network > Proxy Sets Table). Configure the Proxy Set for the Lync Mediation 
Server: 
From the 'Proxy Set ID' drop-down list, select "2". 
a.  In the 'Proxy Address' column, enter a second IP address or the FQDN and 
the listening port of the secondary Lync Mediation Server. 
b.  From the 'Is Proxy Hot Swap’ drop-down list, select "Yes". 
6.  Click Submit. 
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