H323 Dial Peer made simple

H323 dial peers play an important role in Call routing though a H323 gateway. Understanding dial peers is very crucial for Call routing or any dial plan design. Most of the time people are confused between POTS and VoIP dialpeers and how they should be used. I will try to make the concept as easyContinue reading “H323 Dial Peer made simple”

Scenario#3 – Change of Administrator Username Password

You will come across this situation where the customer forgot the CUCM GUI Admin username or password or both. In that case you can still login to CUCM GUI by adding another user from CUCM CLI. SSH to CUCM – the Administrator ID can not be changed once you have set it during Installation. ThisContinue reading “Scenario#3 – Change of Administrator Username Password”

CCIE Voice Lab Strategy

CCIE Lab is one of the toughest IT exam out there and I believe CCIE Voice is “the” toughest (I am not making this up, this has been acknowledged by Quad/Triple CCIEs) as it involves so many applications which can break and go wrong so easily if you are not good in configuring them. MakingContinue reading “CCIE Voice Lab Strategy”

How to resolve Replication Issues

So many times in real world you will come across ‘Database replication Issues’. Replication Issues are also very much possible during your CCIE lab so one must be prepare to deal with such Issues. How can you find if your cluster has proper replication? Here are few tools to find out replication Issues: RTMT: RTMTContinue reading “How to resolve Replication Issues”

Scenario#2 – Extension Mobility won’t work CUCM 6.1.1

I have come across so many customers who have the same issue – Extension mobility won’t work when you try to login. It will log you in but then quickly logs out the users. The only workaround is as follows: Restart the TFTP service on all servers Restart the Extension mobility service on Publisher RestartContinue reading “Scenario#2 – Extension Mobility won’t work CUCM 6.1.1”

IP Phone Background Image

Background Image on Gen 2 and Gen 3 Cisco IP phones can be changed by using the following procedure. I will be showing you how to do for a Cisco 7965 IP phone but the same procedure can be used for other IP phones (like 7941. 7961, 7945 etc). The only difference between different familyContinue reading “IP Phone Background Image”

Scenario#1 – VG224 – Strange DTMF behaviour

Problem description: One of my customer reported an issue with their VG224. All Polycom conference phones connected to the Vg224 were facing an strange issue of DTMF tones not recognized by PSTN. Users trying to get into a MeetMe conference were having¬† tough time as their pin was not getting recognised. Analysis & Observations: ThisContinue reading “Scenario#1 – VG224 – Strange DTMF behaviour”

H323 Call Preservation

H323 gateway is a non-survivable endpoint. This means an active call will drop if any call manager goes down. This default behavior of an H323 gateway can be changed by playing with few settings at the CUCM and gateway. At gateway: voice service voip h323 call preserve At CUCM: Allow TCP Keepalive for H323¬† =Continue reading “H323 Call Preservation”