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Secondary dial tone heard on inwards calls from PSTN with T1 CAS MGCP gateway
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: