IP Telephony and Phones

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I've noticed that some IP phones, specifically the 3905 model, enter "configuring IP" mode. Upon diagnosing the issue, I observed that these IP phones lose their IP addresses from the DHCP server. Even when configured in static mode, the problem is t...

Hi, I am using CUCM version 12 and ISR4321 as a voice gateway. There is a E1 connection as well as SIP and FXO connection. Everything is running fine but if I call to a switched off mobile phone from ip phones it hears ringback tone for a while for b...

Hi for several weeks, 6825 headphones operating with DBS-210 (multicell) bases periodically send some codes, it happens when turning on the handset or changing the base.Calls on the exchange are visible as incoming from the number configured in the h...

M.S.88 by Level 1
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