Go back to 640-460 - IIUC Implementing Cisco IOS Unified Communications (IIUC)

Question :-

You are CCNA VOICE associate in .com. One user from your company wants to use a signaling protocol on the voice gateways that require registration with the Cisco Unified Communications Manager. Which protocol should you suggest to him?
SIP
Frame relay
SRTP
MGCP

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