Which command must be configured on Cisco Unified Border Element?

An administrator is working on an issue between the customer’s Cisco Unified Border Element and the service provider. The provider only wants to see mid-call signaling from the Cisco Unified Border Element for fax calls. Which command must be configured on Cisco Unified Border Element?
A. midcall-signaling passthru
B. no update-callerid
C. midcall-signaling passthru media-change
D. midcall-signaling preserve-codec

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2 thoughts on “Which command must be configured on Cisco Unified Border Element?

  1. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-cube-midcall-reinvite.html

    Mid-call Signaling Passthrough – Media Change
    Passthrough media change method optimizes or consumes mid-call, media-related signaling within the call. Mid-call signaling changes will be passed through only when bidirectional media like T.38 or video is added. The command midcall-signaling passthru media-change needs to be configured to enable passthrough media change.

  2. I believe this is the command.

    Cisco-3925(config)#voice service voip
    Cisco3925(conf-voi-serv)#sip
    Cisco-3925(conf-serv-sip)#midcall-signaling ?
    block Block all SIP messages in midcall
    passthru Passthrough SIP messages from one IP leg to another IP leg
    preserve-codec preserve initial negotiated codec i.e. midcall codec change denial

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