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problem in cisco ip phones

hi i am user of cisco packet tracer 5.3. i made my own project using youtube videos. i have used a cloud using EIGRP protocol on t,he routers. i have used a pc and 4 ip phones on eah router using a switch. when i am trying to call to the same network no from a ip phones it rings out. but when i am trying to call to another network no it shows unknown no but the ping command is working on all. now please tell me that may i use ip phones on wan or cloud if yes then remove my error from the program and tell me the error please. it is  my major project so please help asap. i shall be thankful to you.

you can download my project by clicking on "using ip phones". please contact me at

for my solution if you got any.

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