There are a number of excellent documents on the subject of ExpressWay traversal DMZ design and handling NAT. I must however commend Cisco on the updates on… Read more “ExpressWay DMZ and NAT Design Considerations”
Tag: SIP
Implementing Loop Prevention on CUBE
We work quite a lot with a single ITSP in our smaller deployments, but keep hitting a problem with number porting. We’re repeatedly facing a problem whereby… Read more “Implementing Loop Prevention on CUBE”
Unity Call Extended for Recording Fails
While implementing an Auto Attendent today, we faced a challenge as the client did not want to pay for professional recordings, and needed to implement quickly. If… Read more “Unity Call Extended for Recording Fails”
Lua Script Solves Call Forward Masking
Had to implement an Auto Attendant in Unity today. The client had a requirement to send after-hours calls out to the PSTN, but had to be routed… Read more “Lua Script Solves Call Forward Masking”
SIP SRST Dialling Fails Due to Header Addressing – CSCur95578
Haven’t been able to post in a while as my current project is keeping me very busy! As the core multi-cluster deployment is now complete, we’ve moved on… Read more “SIP SRST Dialling Fails Due to Header Addressing – CSCur95578”
Lua Scripting – Replacing FQDN with IP in SIP Headers
A friend of mine at Cisco TAC pinged me a few days ago, asking to assist him with a case he’s working on that required a sip normalization… Read more “Lua Scripting – Replacing FQDN with IP in SIP Headers”
Lua Scripting – Proxied Manager Breaks MWI for Centralized CUC Behind SME
I’ve been working as design and deployment lead on a globally significant full Collaboration on-premise deployment for the last 3 months (think 120 CUCM across 9 Leaf… Read more “Lua Scripting – Proxied Manager Breaks MWI for Centralized CUC Behind SME”
Forcing MTP Killed the Mid-Call
There’s a common misconception with Cisco SIP trunking that the desperate “Forced MTP” will always solve no audio, one-way audio, DTMF inter-working and every other media negotiation… Read more “Forcing MTP Killed the Mid-Call”
DTMF Interworking and the MTP
I came across this a while back when deep diving MTP when preparing for the lab. I’ve pretty much got it down now, but I keep coming… Read more “DTMF Interworking and the MTP”
UCCX – CTI Registration Fails after CUCM Upgrade to 10.5(2) – CSCuq26061
Had a strange one today… A colleague completed a CUCM upgrade from 10.5 in-version. No issues were experienced after the minor upgrade. However, a few days later… Read more “UCCX – CTI Registration Fails after CUCM Upgrade to 10.5(2) – CSCuq26061”
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