Pasha Teplitsky

I had a licensing overage I couldn’t explain, so I asked AI to investigate.

Pasha Teplitsky — Tue, 21 Jul 2026 17:39:13 +0000

I was looking at licensing numbers on a CUCM cluster last week and something didn't add up. More device licenses consumed than users who should have them. Not a huge gap — but enough to make me dig. So I asked Claude Code to check every phone's Owner User ID field against who actually controls … Continue reading I had a licensing overage I couldn’t explain, so I asked AI to investigate.

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SIP 100 Trying Response Code for SIP Troubleshooting

Pasha Teplitsky — Mon, 16 Nov 2020 13:00:02 +0000

SIP 100 Trying response code is part of the 1XX SIP Response Codes and one of the most commonly used SIP response codes in the SIP stack. SIP works on a request-response model and 1xx SIP response codes are there to provide information on the status of network-related processes, SIP 100 Trying is one of … Continue reading SIP 100 Trying Response Code for SIP Troubleshooting

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SIP 404 Not Found – Understanding SIP 404 Response Code

Pasha Teplitsky — Mon, 09 Nov 2020 13:00:00 +0000

SIP 404 Not Found response belongs to the 4xx SIP code group.A group of SIP codes that indicate a request failure and constitutes a number of codes used by SIP for communicating errors and failures. In this blog post we will explore the SIP 404 Not Found response code and touch the different available SIP … Continue reading SIP 404 Not Found – Understanding SIP 404 Response Code

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How To Properly Configure Cisco CUBE HA

Pasha Teplitsky — Fri, 23 Oct 2020 08:35:44 +0000

Cisco CUBE HA is becoming more prevalent with the CSR1000 or vCUBE, therefore with its popularity, learning how to configure Cisco CUBE HA has become an essential skill that UC engineers should have. General Overview of Cisco CUBE HA Cisco CUBE HA provides preservation of: Transcoded calls Media and Signaling for Active Calls Calls in … Continue reading How To Properly Configure Cisco CUBE HA

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Cisco SIP SRST Configuration

Pasha Teplitsky — Wed, 07 Oct 2020 13:00:00 +0000

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. In this blog post, we will provide you with a step by step process that outlines a Cisco SIP SRST Configuration. There are … Continue reading Cisco SIP SRST Configuration

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Configuring Options Ping on CUBE

Pasha Teplitsky — Sat, 03 Oct 2020 13:00:00 +0000

Step by step guide to configuring options Ping on CUBE. Learning how to busy out a dial-peer when a SIP trunk goes down. SIP Options Ping on CUBE.

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SIP Response Codes Explained

Pasha Teplitsky — Sat, 08 Jun 2019 15:59:26 +0000

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 … Continue reading SIP Response Codes Explained

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Cisco SIP Gateway configuration: The Ultimate Guide

Pasha Teplitsky — Tue, 04 Dec 2018 22:23:40 +0000

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 … Continue reading Cisco SIP Gateway configuration: The Ultimate Guide

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CUBE Configuration Step-By-Step. Part 2

Pasha Teplitsky — Sun, 14 Oct 2018 12:52:40 +0000

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. Edit: I recommended using the CUBE Config Utility in conjunction with this post In the first … Continue reading CUBE Configuration Step-By-Step. Part 2

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CUBE Configuration Step-By-Step. Part 1

Pasha Teplitsky — Sat, 13 Oct 2018 16:00:49 +0000

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. Edit: I recommended using the CUBE Config Utility in conjunction with this post I figure that you’ve already … Continue reading CUBE Configuration Step-By-Step. Part 1

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