Sometimes we unfortunately still have legacy requirements to support ISDN that still need to upgrade to SIP Trunking. DTMF and even fax tones can be a pain… Read more “Troubleshooting DTMF from ISDN PSTN”
Category: IOS Devices
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”
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”
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”
afterthenumber 