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DTMF issue (SIP INFO--> RFC4733

SIP-INFO is currently being used in my environment. I need to integrate with a vendor that do not use SIP-INFO. I am trying to figure out the best way for DTMF to work when they are transferring call back to ivr.

Here is the flow: customer—>carrier—>sbc—>vendor(a)(sip-info)realm1—>vendor(a)sip-info)realm2—>sbc—>avayasm—>ivr options press ivr(sip-info)—>avayasm—>sbc—>vendor b.

when customer pressed digit to go back to vendor a (ivr)—>sbc send an invite followe by(sip-info) —> vendor b(responded with 415 unsupported media). How do I go about setting up the SBC not to send SIP INFO when vendor (b) is in the rotation.

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