AAR incoming CSS

Hi everybody

please can someone explain me what is the real meaning of the AAR CSS in inbound calls configured in GW or Trunk ?

i tried to search some informations on the net but still it's not clear at my eyes..maybe something related to Location configured for example on GW?i mean if location is exhausted for that GW and one call is incoming from PSTN , does it reroute that call somewhere else reached from that CSS configured ?

Thank you for you help





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