Real World Scenarios

Scenario#51 – Unity Toll Fraud

The other day one of our key customer logged a priority incident with regards to a Toll Fraud. Their Carrier alerted them for possible malicious calls originating from their main ISDN number going to The Bahamas. At First I thought this has something to do with their Expressways so I checked Call logs and EventsContinue reading “Scenario#51 – Unity Toll Fraud”

Scenario#50 – Cisco MRA: Jabber cannot connect Softphone mode over Expressway

Due to COVID-19 and the global pandemic situation more and more people are working from home and are coming across different challenges. Many of them who use to work from a corporate location are coming across issues that they never faced before. I worked on such a case recently where a user was having aContinue reading “Scenario#50 – Cisco MRA: Jabber cannot connect Softphone mode over Expressway”

Scenario#49 – UCCX: Call gets System Error message on IVR

I was looking at an issue a few days back where a customer complained that when they are selecting a particular IVR option the call gets connected to Music on Hold and then before it gets transferred to an Agent the caller hears “Sorry we are experiencing system problems……” the famous CCX default message whenContinue reading “Scenario#49 – UCCX: Call gets System Error message on IVR”

Scenario#47 – Jabber users see ‘offline’ status after logging in

I came across an issue for a client where few of their users would login to Jabber (ver 10.5) and see their presence status as ‘offline’. They won’t be able to change it as well. Other Jabber users will also see them as ‘offline’ even though they are logged in and should be online. ThatContinue reading “Scenario#47 – Jabber users see ‘offline’ status after logging in”

Scenario#46 – 9951 SIP phones drop call after 18 seconds

Recently I came across an issue with a new customer deployment where the 9951 SIP phones would drop call after 18s. All other SCCP phones were working fine but only these SIP phones would drop the call. Call flow: 9951 -> SIP -> CUCM -> SIP -> CUBE Bind commands were in place andContinue reading “Scenario#46 – 9951 SIP phones drop call after 18 seconds”

Scenario#45: 7841 SIP phone in Registration loop

I was working on this customer issue last week where they added a new 7841 phone but it was not registering properly or should I say it was registering briefly before unregistering. Call Manager was 9.1.2.11900-12 which does not support 78XX phones so customer actually applied the device pack cmterm-devicepack9.1.2.12039-1.cop so that they can addContinue reading “Scenario#45: 7841 SIP phone in Registration loop”

Scenario#44 – CME Call Forward to Internal Extension not Working

I came across an interesting issue for a Swiss customer where they were having problem with Call-forward to an internal extension on their CME systems. Call-forward to an internal extension seems quite straight-forward so I checked how telephony-service is configured and found both call-forward patterns as well as transfer-pattern were configured as .T .. soContinue reading “Scenario#44 – CME Call Forward to Internal Extension not Working”

Scenario#43 – CUCM 9.1(2) RL/RG Reject Issue

Few weeks back I came across a issue for a customer who are on CUCM 9.12() cluster. The issue was outbound calls not reaching either of the MGCP gateways from a Translation pattern even though both gateways were registered fine with Call manager. I checked the E1s and MGCP status and all was OK. TheContinue reading “Scenario#43 – CUCM 9.1(2) RL/RG Reject Issue”

Scenario#42 – CUC not working after adding Secondary Server

I came across an interesting scenario few days back where customer added a CUC Secondary server back to the Cluster but it was not working as it should. Customer had two CUC servers in the cluster in a load-balanced configuration with half of the ports on unity-02(sub) and other half on unity-01(Pub). For some hardwareContinue reading “Scenario#42 – CUC not working after adding Secondary Server”