PRI Utilization in SIP Dialer

Question

Hi All - Is there any way to achieve Utilization of Multiple PRI in Single Gateway with CUSP Deployment.
Let's say i have 5 PRI'S in same VG, Suppose if one of the PRI goes down is there any option to utilize remaining 4 PRI'S in the same VG.
I checked SRND, where i can see IF VG is overloaded and loses it's WAN connectivity with PSTN it will return error code as 503
In CUSP we can configure Failure response code as 503 so that CUSP will take alrenate element and route it accordingy.
If that is the case, We are not utilizing remaining 4 PRI'S in the first VG.
Is there any way to achieve the remaining 4 PRI'S without jumping to alternate element in CUSP.
SIVANESAN R       

Answer 1

Hello Sivanesan,
If you have 5 PRI's. Do you have 5 different dial-peers in the Voice Gateway for the same destination pattern ? Do you have Preference command given in the dial-peer ? Basically If a Call matches more than one outbound dial peer, the router itseld hunt them in order as per your configuation. If the Call setup failed for some reason, the next dial-peer will be attempted. Its based on the hunt order you specify.
In the voicegateway global config mode use the below command, you should see 7 options, based on your configuration the dial-peer will be hunted. This happens within the Gateway/Router before sending the response to CUSP
VG3845(config)#dial-peer hunt ?
  <0-7>  Dial-peer hunting choices, listed in hunting order within each choice:
  0 - Longest match in phone number, explicit preference, random selection.
  1 - Longest match in phone number, explicit preference, least recent use.
  2 - Explicit preference, longest match in phone number, random selection.
  3 - Explicit preference, longest match in phone number, least recent use.
  4 - Least recent use, longest match in phone number, explicit preference.
  5 - Least recent use, explicit preference, longest match in phone number.
  6 - Random selection.
  7 - Least recent use.
Regards,
Senthil