Cisco SIP SRST Configuration is the process of providing backup to external SIP Call control (IP-PBX) through the provision of the basic registrar and re-direct server or back-to-back user agent (B2BUA) services.
Continue reading Cisco SIP SRST ConfigurationTag: SIP
SIP Response Codes Explained
Why don’t we start with some trivia?
Did you know that SIP response codes are based on HTTP/1.1 response 
codes?
Actually, SIP response codes are the extent of the original HTTP ones and even define a new class with more response codes. I’ll let you know which one when we get to it.
That said, not all of the HTTP codes are relevant and mapped to SIP response codes, so if you know some HTTP, don’t expect to find them all in this list.
Continue reading SIP Response Codes Explained
Cisco SIP Gateway configuration: The Ultimate Guide
Connecting the Cisco IOS Voice Gateway to CUCM via SIP has been the preferred way to do it in the past couple of years.
The slowly dying H323 protocol (ISDN based) is not being developed anymore while SIP (HTTP based) became the industry standard for VoIP. So whenever PSTN connection is implemented via an IOS Voice Gateway, the choice should be really between SIP & MGCP.
This is how it’s done, step by step, using SIP.
Continue reading Cisco SIP Gateway configuration: The Ultimate Guide
CUBE Configuration Step-By-Step. Part 2
This is a second post in the series of CUBE configuration. You can find the first one here.
In this post, I’ll cover some of the more advanced issues and scenarios that most of us are facing with CUBE configuration.
CUBE Configuration Step-By-Step. Part 1
It’s Monday morning, you are checking your Email after a long weekend just to find out that your boss was quite busy and you have been assigned a new project.
The good news? It involves ITSP and CUBE.
How to punch SIP One Way Audio in the face
And why should you punch it in the face?
To be honest, mostly revenge…
Because one-way audio and no audio problems hurt.
Really bad.
Especially when they hit you by surprise, as they usually do.