Cisco IOS Software based voice gateway runs Media Gateway Control Protocol (MGCP) for VoIP signaling control between the gateway and Cisco CallManager. External callers hear a period of secondary dial tone for inwards calls, specifically Public Switched Telephone Network (PSTN) towards Cisco CallManager. After this burst of dial tone, the call proceeds as expected: the IP phone rings and the external caller hears an in-band ringback.
This is the configuration for the customer's voice gateway router:
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