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voip drop line in ten minutes

I have two site with cisco 2620 router & leased line connected. the function of voip through E&M module attached to PABX on each site. When I dial another site through voip, the phone call only keep ten minutes and dropped constrainedly. I check the pabx and there is no associated parameters set.

Could anyone can help me how two make necessary modification of my IOS configuration or what this issue generated.

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Re: voip drop line in ten minutes

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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