Audio delay when call is answered, CUCM 8.0

I have a client who is reporting an audio delay when a call is made to an external number. Call setup is fine and ringing begins immediately after the last digit is dialed. When the called party answers there's a 1 or 2 second delay before either party can hear each other.
Outbound calls are routed to a SIP trunk. I am suspecting that an MTP is required but checking that off causes all calls to fail.
I then discovered that the only MTP defined in CUCM is the default and this is in a different device pool than the SIP trunk with the delay issue.
Before I got through a possilbe hardware purchase (router, dsps, etc.) for the site with the problem I was hoping someone could confirm that this may in fact be the issue.
Thoughts?

Under older versions of CUCM, you can set that same parameter as a global Service Parameter for the CallManager process.You can try that. Newer versions pushed the setting down to the individual trunk level. Be aware the global setting will affect all calls on all SIP trunks, so test carefully after the change.

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Audio delay when call is answered, CUCM 8.0

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