incomming call suddenly disconnected in UC520 platform

i have following IP telephony system currently installed in
our office :
UC520-32U-8FXO-K9
sometimes if outside person call us the reception IP phone ring
when he wants to pickup the call he does not hear any body
and the call disconnecting
please advice
ashraf2002Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

TheMakCommented:
It might be connectivity issue between IP telephone and the server it is using for registration. Check with the IP telephoy provider and explain him about the problem you are facing. And also check your internet connectivity for any drops packet.
 
Regards,
0
ashraf2002Author Commented:
actually all IP phones currently installed within our local LAN and the call manager in our local LAN too
0
TheMakCommented:
In that senario Extension to extension or you can say calls in LAN will work fine but if some one calls you from outside then they will first hit the IP Telephony server ie.. VOIP server and for that outside calls you need to check what I mentioned above for call drops and quality.
And also remember if other person is all using some IP telephony service then same thing applies to him as well to have good communication. some time everything willl be fine on your side but problem on the outsider who is calling. Its all dependent on internet connection on both side.
 
Regards,
0
Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

ashraf2002Author Commented:
we faced the problem with outside callers , they are call us on our FXO lines there is not any internet
connection between us
0
TheMakCommented:
Defination of IP telephony: IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user. Much of IP telephony focuses on that challenge. For More click the link below,
http://searchunifiedcommunications.techtarget.com/sDefinition/0,,sid186_gci212388,00.html 
 IP Telephony Basics,
http://www.althosbooks.com/ipteba.html 
0
ashraf2002Author Commented:
dear sir
i know the IP telephony basics i am CCNA voice certified i need a solution for my problem is that possible ?
best regards
0
shameer2000611Commented:
just issue the command 'supervisory disconnect signal' under the fxo port and test this.This command may  be varying depends up on the router platform model

Regards
Shameer
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
IP Telephony

From novice to tech pro — start learning today.