IP Telephony and Phones

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Dear, I have CUCM 10.5 and 2911 in one of my branch for srst refrence with WAN link down for twenty 7821 SIP Phone. the problem is that when going to srst mode they all register and after about 1 or 2 minute ip phone get unregistered and then registe...

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 ...

Would like to setup SIP on a Cisco 7970 IP Phone.  Have downloaded the following SIP firmware from cisco site. But not sure where to go from here. 7970 and 7971 SIP IP firmware files only - Compatible CUCM Versions: 7.1(5)+  cmterm-7970_7971-sip.9-4-...

Hello, I have CUCM and CUC.  I am trying to setup a department where they want the main number to ring on the phone first, then if no one answers or if busy, it rolls over to a call handler to allow the caller to choose which office to leave a voice...

jkring001 by Level 1
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Hi all, this is my first post on this Cisco VoIP forum as I am a newcomer to the field with a Cisco networking and security background.  At the moment I am tasked to deploy Cisco VoIP for our company for which we bought 2 B7K units and 2 Cubes.  W...