Hi
We have Os4000 v.8 system and interconnected cellular provider by PRI E1. OS4000 -by E1 to- UCM Grandstream IP- by SIP to -Cellular provider.
Sometimes, When I make a call to cellular phone on the calling side (A) doesn't hear calling ton, but on cellular phone ( B side) ringing normally, when answer no voice in both side.
Sorry my poor English, What we should check configuration.
We have Os4000 v.8 system and interconnected cellular provider by PRI E1. OS4000 -by E1 to- UCM Grandstream IP- by SIP to -Cellular provider.
Sometimes, When I make a call to cellular phone on the calling side (A) doesn't hear calling ton, but on cellular phone ( B side) ringing normally, when answer no voice in both side.
Sorry my poor English, What we should check configuration.