Can't make outgoing calls but receives fine (I believe it's the ISP)

Hi.A small company were maintaining that uses a uc500 on a dedicated voip line suddenly can't make outgoing calls.This has occured on another two occasions when they were using a different ISP and It was due to them not paying their bill on time.This time we've called the ISP and they Insist everything Is fine on their end and that the company hasn't been disconnected.I can't find anything wrong with the UC.I can ping the ISP gateway.I can ping their SIP server and everything looks fine.I've added two debug files and would appreciate any assistance as my debugging knowledge Is not that great !

Turns out the ISP was receiving calls In G729 and they use G711 Alaw.We didn't change any configuration on our side so I'm not sure what happened.I've set the sip trunk to use g711 alaw via CCA but calls are still going through as g729.I'm not sure what to configure via the cli.I assume It has something to do with transcoding but my telephony cli knowledge Is limited.
Should I change the configuration for Individual dial-peers or Is there some global config. I can enter ?
I added g711alaw to a dial peer and now I can't make any inbound calls either.I removed the g711alaw from the dial peer but It hasn't changed anything.
Running debug ccsip message I receive "error 304 media type(s) unavailable. q.850 cause=65"
I didn't expect such a small change to cause so much havoc.

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Can't make outgoing calls but receives fine (I believe it's the ISP)

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