You should provide details of the setup when opening queries like the router model , ios version, running config etc. You may try / check the following:
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Configure the voice call send-alert Cisco IOS global configuration command in the terminating gateway/router.
This command enables the terminating gateway to send an alert message instead of a progress message after it receives a call setup.
Refer to Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2 for more information on this command.
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Upgrade the Cisco IOS Software on the originating gateway/router to Cisco IOS Software Release 12.1(3a)XI/12.1(5)T or later.
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If the previous solution does not work, configure the terminating gateway to send a PI = 8 in the Alert message by configuring the progress_ind alert enable 8 command under the voice dial-peer # pots configuration.
This command overrides the PI value received in the ISDN alert message. It causes the router to cut through the audio path back towards the calling party prior to connect.
Reference
http://www.cisco.com/c/en/us/support/docs/voice/h323/22983-ringback.html
Manish
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