How to capture traffic on Cisco ISR 4000 ?

Introduction In this article we will see how we can capture and export network traffic on a Cisco ISR 4331. The provided instructions are applicable to any Cisco ISR 4000 series router. The exported traffic has a pcap file format and therefore can be easily opened and analyzed in Wireshark. The ISR 4331 used in

Load SIP Firmware to Cisco 7900 IP Phones.

Introduction In this post we will learn how to upload SIP firmware to Cisco 7911 IP Phone. This will make possible using the phone with third party SIP servers. The instruction below applies to all Cisco 7900 series IP phones. Step 1. Download the SIP firmware. Before we start, let’s download the required SIP firmware

Cisco IP Phone Firmware Upgrade on CME.

Introduction This article show step by step how to upgrade the firmware of a Cisco IP phone managed by CME(Call Manager Express). I will be upgrading Cisco 8851 IP phone(from version 12-0-1-11 to 12-5-1SR3-74) using Cisco ISR4331/K9 router as a CME. Step 1. Download the firmware files The first thing we need to do is

Voice VLAN on HPE OfficeConnect 1920S.

Introduction In this post we will configure voice vlan on HPE OfficeConnect 1920S switch. The switch will be used for connecting Cisco 8851 IP phone, which will detect the Voice VLAN and get an IP address from the correct VLAN. The PC connected through the IP phone will remain in a Data VLAN. The exact

IRF stack configuration (2 x HPE 5130 switches).

Introduction In this article we will setup an IRF stack with two HP 5130 switches that run Comware OS. What is IRF? IRF (Intelligent Resilient Framework) is a proprietary virtualization/stacking technology used in some HPE switches. It has been developed originally by H3C, but later HPE acquired H3C. IRF allows us to interconnect several switches

Call Queues in FreePBX.

Introduction In this article we will go through all the steps required to configure call queues in FreePBX 13. Call Queuing is a feature of almost any call center which allows you to keep incoming calls in a queue while they are waiting for their turn to be served by agents. Requirements I assume that

How to verify a checksum in Linux?

Introduction In this article we will learn how to calculate and verify a checksum of a file in Ubuntu. We will also see what a checksum actually is and why we should care. You can jump straight to the CLI commands. What is a checksum? A checksum (also called a hash or a digest) is

How to bypass SIP blocking by ISP?

Introduction In this article we will see how we can bypass SIP traffic blocking. There are a lot of countries where local ISPs block SIP traffic. It makes it impossible for enterprises or private persons to leverage from low rates on international calls provided by various SIP trunk providers. Solution One of the solutions is