January 16th, 2006
Just did some work troubleshooting an audio delay issue with Cisco gateways, Polycom SIP IP Phones, and the Interactive Intelligence (I3) call center server.
The problem that existed was one where any calls running through the I3 experienced 2-6 seconds of delay. The root cause appears to be dynamic jitter buffers growing abnormally large almost immediately, then causing the playout of conversation to be delayed.
The cause wasn’t QoS related because calls directly between the Cisco gateways (2811’s) and the phones worked perfectly.
Calls involving the Intel HMP software on the I3 server however saw jitter on the order of thousands of milliseconds.
The “temporary” fix was to lock the jitter buffers on the HMP software to 6. This seems to have cured it.
My main question is, where in the software does the problem really lie?
Posted in Cisco Gateways | No Comments »
January 6th, 2006
Having seen numerous problems pop-up on lists many times, I think I’m going to write a mini-guide on CallManager route patterns and route filters.
I’ve used filters since CM 3.0, and am quite familiar with them and their quirks.
Look for a guide to be posted here in the near future.
Posted in Cisco CallManager | No Comments »
January 6th, 2006
Well, now that I’ve written a basic app, I feel it’s time to get serious about this.
I’m seeking comments on what folks would like from an app that could forward phones (possibly extend to ringers).
Post a comment and let me know what you’d like to see.
Posted in Cisco CallManager | 1 Comment »
December 15th, 2005
Well, sorry to my 2 readers about having been gone so long. Some interesting things have happened.
I quit my job. (I won’t go into why)
I started my own business. I’ll say I enjoy being on my own. I can now truly serve customers they way I believe they need to be served. Anyone need help with IP telephony or networking? 
I wrote my first AXL/SOAP application. It allows you to forward or unforward any line on any CallManager based phone from the phone. Why is this unique? Well, since currently you can only forward or unforward the primary line on a phone, I thought it’d be nice to be able to do it from any line (I’ve seen zillions of customer requests on this one). I’ve zipped the app and the source code (and documentation) up and it can be found here (or check files and downloads):
http://www.voipexpert.us/files/axlphone.zip
Posted in Cisco CallManager, Personal Blog Entry | No Comments »
September 28th, 2005
Yet another reason to dislike their products – poor design.
Apparently one of their applications (Call Track Pro – a FAC application), tries to open JTAPI ports in a very illegal and bad way. They had the gaul to blame Cisco for their product failing.
Their support also isn’t that reliable, almost takes an act of God to get them to move.
I also just found out this product isn’t certified on CallManager 3.3 or 4.1, and they also don’t have an active developer agreement with Cisco. Just idiotic IMHO.
Posted in VoIP | No Comments »
September 26th, 2005
I’ve got ample room, and could host a few folk’s blogs if anyone would be interested. Preferably tech-related sites. Just send an email or drop a comment.
Posted in Personal Blog Entry | 2 Comments »
September 26th, 2005
It would seem this blade is finally becoming stable. I’m seeing it used more, and am hearing rumors of the 6608 getting discontinued sometime within a year or so.
I’ve always been a fan of this blade given it’s capabilities. I’m glad to see it finally (only took three years) working to the point where’s it a useable device for everything (gateway, conference/transcode and FXS analog).
Posted in Cisco Gateways | No Comments »
September 17th, 2005
Well found another bad DSP’s point themselvs out. If you ever see a “Resource Unavailable” message in a Q931 debug, it’s a good bet you might have a bad DSP.
type “show voice dsp group all” to check your DSP status. If any aren’t “UP”, or in a state of “FAIL”, you’ve got a bad DSP set. Call TAC and a get a new one.
Posted in VoIP | No Comments »
August 31st, 2005
Well, I learned something interesting today. IPCC Express can manage multiple time zones, including those silly little areas that don’t change their clocks – ever.
It’s not pretty code, but it works 
Posted in Cisco IPCC Express | No Comments »
August 28th, 2005
Well, I just passed my voice written test. Still a tough one, but now I can schedule my lab.
Anyone out there done the voice lab yet? I know a few that have passed it, but I’d like to hear from more if possible.
Posted in VoIP | No Comments »