I added a prefix for outgoing calls through the gateway on the route group level to route calls through a particular FXO port.
Once the call gets connected to the gateway, the inlcuded prefix is appearing on the IP Phone. (very strange because the prefix is added at the route group level, not the route pattern).
Is their anything missing or need configurations to disable the display of this prefix on the IP Phone ?
The "alwasy display primary connected number" parameter has some limitations on forwarded calls, so I don't want to use it.