I have a customer with 15 users who are using third party "One IP Telephone System. The VoIP phones are connected a Cisco Switch and Cisco switch is connected to Cisco 871 Router. They are using cable modem for SIP and Internet.
They are able to make outbound calls but with incoming calls, One person is able to answer the phone but after that all other phones still ring but as soon as the call is answered the call is dropped) They are using are 3rd party company for there VOIP service.
Previously, they were using Linksys router and there was no issue with the incoming calls, but after replacing Linksys with Cisco Router they are having issues with incoming calls.
I am not able to troubleshoot the issue, and will appreciate if someone can help
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