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CUCM 5.x when the called PSTN party is busy or switched IP Phone giving ring tone

In CUCM 5.x when the called PSTN party is busy or switched off IP Phone is giving ring tone, please advice what I am missing in config, or it is related to E1 trunk issuse.

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Re: CUCM 5.x when the called PSTN party is busy or switched IP P

which type of GW u r using H.323, MGCP or SIP?

and on the PSTN side, let us know which type of trunk?

Thanks

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