Facts about MGCP E1 PRI gateways: –You must configure the MGCP gateway for SRTP encryption. Configure “mgcp package-capability srtp-package.” –The MGCP gateway must have an Advanced IP Services or Advanced Enterprise Services image (for example, c3745-adventerprisek9-mz.124-6.T.bin). –Protected status gets exchanged with the MGCP E1 PRI gateway by using proprietary FacilityIE in the MGCP PRI Setup, Alert, and Connect messages. –Cisco Unified Communications Manager plays the secure-indication tone only to the Cisco Unified IP Phone. A PBX in the network plays the tone to the gateway end of the call. –If the media between the Cisco Unified IP Phone and the MGCP E1 PRI gateway is not encrypted, the call gets dropped.
Like I say, add that command, check your IOS feature set, and remove the crypto map for now. If that works and encrypts, time to get your Security hat on.
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