IP Telephony and Phones

We have SIP phones in remote sites. After changing the site router, these phones cannot register with the Call manager unless change the device security profile settings from TCP+ UDP to UDP only.   Is there any body faced the same issue before.   Th...

HiWe have CUCM 11.5 and SIP trunk modem that is connected directly to Mikrotik. we have confronted with voice quality issue and some times it's robotic and some times choppy. There might be network, server or client side problem, but I don't know how...

Can someone explain the difference between 729 and 711 codec, and the advantages and disadvantages?

We're having issues getting SIP inbound/outbound calls working. Outbound calls receive an immediate fast busy signal. I have posted my config along with debug ccsip messages. Assistance with a resolution would be much appreciated.    

please im having some strange dial peer patterns which i cant figure out what digits they match up with , can someone explain them:   dial-peer voice 53 potsdescription ** incoming dial peer **incoming called-number ^AAAA$    ###### what does this ma...

I am running CUCM 11.5 and I have a user that when she logs into the self portal she has her phone as well as another phone that is not linked to her in anyway. I have verified all the configuration and I cannot see nothing wrong. The other phone tha...

A customer has security concerns with TFTP protocol. Is there any other way to get the firmware to a phone without using TFTP?

What kind of tools we have on ISE 2.3 and what can we automate in 2.3 versions?We have been purging in place. Can I have suggestions? 

Our phone system inside my company is Cisco Call Manager and uses remote destination profiles to allow users Skype for Business clients redirect to their mobile. Calling a Skype pc client from a desk phone displays the caller’s name but the client on...

Good day,   I just have a few questions about upgrading CME on a router. I know it's tied to the IOS, I have done CME upgrades before, but never have done them from this old of a version to this new of one.   I'm more curious over licensing. The CME ...

i Configured SIP trunk between Voice Router and Freepbx the Freepbx Extensions are 3..i need to add Prefix Number 8 on Voice router , so i will call 83.. instead of 3.. and i need to reach to FreePbx with its original 3.. what i made as below but not...

i Configured SIP trunk between Voice Router and Freepbx the Freepbx Extensions are 3..i need to add Prefix Number 8 on Voice router , so i will call 83.. instead of 3.. and i need to reach to FreePbx with its original 3.. what i made as below but not...

I am attempting to configure a 2951 with a Cube license to go between an IP phone system (Avaya IPO) and the SIP provider.  When I call in, I see call info coming into the CUBE, however it never goes beyond there.  When I attempt to make an outbound ...