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CUCM 6.1 to Fax Server using H3.23 trunk

I have a request from a customer we support to create a connection between their CUCM 6.1(1) to a new Right Fax fax server. We setup an H.323 trunk and it works great until they send a fax to a remote fax that waits more the 2 ring cycles to answer then the call is dropped. I have been looking around and see that changing the H245 TCS timeout, Media exchange interface capability timer, and Media exchange timer all to 25 seconds should resolve this issue. My big question is if I make these changes in the service parameters will this cause a outage of service. Their voice is structured using MGCP gateways and SCCP sets. The only H.323 device is the trunk link to the right fax server. Any input would be great. thank you

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