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Service Provider SIP TRUNK & EXCHANGE 2007 AA no Ringback for PSTN Callers

I have a SIP Trunk from my Service Provider Terminated on my Cisco 2811 VG

calls are coming fine to DID Numbers (rining answering everything)...

I have CUCM 5.1 with a SIP Trunk to Exchange 2007 AA

when I call from internal extension I am hearing ringback even when the AA is transfering me to the extension that I have entered

but when I call from PSTN to the AA Number although the call is answerd by AA & DTMF is working fine but I am not hearing any ringcack in the PSTN side?!?!?!?

the calls are answerd & I can enter the required extension & hearing the Exchange telling okay calling the extension then nothing after that while the enterd extesion is ringing.....

I have MRGL for both GW & SIP Trunk to Exchange

Announciator & MTP are there

H225 Service parameter is set to (use announciator for ringback)

inbound & outbound fast start are enabled in the GW

latest IOS in the GW

progress-ind enable setup 3 has been tried in the VOIP Dial peer (incoming & CUCM)

Appreciating your kind support

Cheers....

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