Note: These archived support documents are for legacy MegaPath Hosted Voice and MegaPath One services purchased before June 14, 2019.
Enabling Caller ID block (Hide my Number) on the Unified Communications client breaks the outbound calling functionality. Check your Hide my Number setting, located under More Call Options > Hide my Number. Disable the Caller ID block/Hide my Number.
If Caller ID Block is needed, use the block feature available for each user in the Voice Administration Portal.