we have issue with intranet overseas call, someone using cisco ip phone call us (we also use ip phone), we can't hear the caller , but the caller can hear us, may i know is this the voice gateway issue or cucm issue?
If it is being routed over the IP network your voice gateway isn't involved, assuming you mean H323/MGCP/SIP when you say voice gateway. You need to check router/switches/security appliances between the endpoints.
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