IP Telephony and Phones

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Hello Guys,   I want to setup conference call system in my office using CUCM. This will allow us to call vendors or they can call our line during a conference meeting.   Currently we have a Cisco ISR 4321 with a 1MFT-T1/E1 module and a PVDM4-32 modul...

Daniel5 by Level 1
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We recently faced a sip NAT issue. and I would like to get some insights for this problem. call flow: Avaya phone system >> telco IPBE device >> ISP telco IPBE is doing the SIP NAT. The call coming into the telco IPBE device: The invite is from 10.2...

from LAN.png out WAN.png back LAN.png

I have a brand new, never configured CP-8865-K9= with firmware sip8845_65.11-0-1SR1-2 Service level is Enterprise. I see the multiplatform firmware for the 8845/65 can be downloaded but it seems no CP-8865-3PCC-K9= is available on the market. Therefo...

N5NHJ by Level 1
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Hello Everyone,   I understand that audit logs give us the details of logged in person who made changes on the CUCM/Unity etc   In unity connection and CUCM how many days old logs can be collected without putting load on server while extracting data?...

Good day!! One question, I try to change the firmware to Cisco 8831 for this "cp-8831-sip.9-3-4-SR2-3PCC.bin.sgn" for connecto to other vendor PBX. But way CUCM OS Administration --> Software Upgrades --> Install/Upgrade not is possible the firmware ...