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CUCME network link keeps dropping out


Hi all,


I'm running a 1900 series as our boarder edge router, One of the ethernet ports of this router is configured as router on a stick.


Plugged into the switch I have a 2811 running CME 8 separately.


The link appears to keep dropping between the cme and our 79xx phones.


The phones loose comms to the cme and this is indicated by the fact that the phones go into registration mode for about 30 seconds before then re-establishing their link to the cme.


I was wondering if I could have some assistance please, i've tried having a look at various posts,  most of which suggested a speed mismatch or something. 


Tell me what you need and i'll upload to ya'll.


Thankyou very much



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