Topics

Virtual LAN (VLAN)

What is a vlan ? Virtual Lan separate an exiting physical network into multiple logical network. Thus each vlan create separate Broadcast domain. Configure a Vlan ASSW#conf tASSW(config)#vlan 10ASSW(config-vlan)#name DATA Assigning Vlan on an Access port We all are familiar configuring vlan on an access port using vlan-id. But From ios version 15.2(3)E2, Cisco IOS XE…

Mobile & Remote Access (MRA)

Cisco Unified Communications Mobile and Remote Access (MRA) is part of the Cisco Collaboration Edge Architecture. It allows endpoints such as Cisco Jabber to have their registration, call control, provisioning, messaging and presence services provided by Cisco Unified Communications Manager (Unified CM) when the endpoint is outside the enterprise network. The Expressway provides secure firewall…

Expressway Zone

When a call reaches Expressway, Expressway classifies it based on source and destination address and port.Based on classification, the call is sent to a specific «zone».Except for the Local Zone , the other zones connect to remote systems as in the case of a SIP Trunk on CUCM Different policies can be applied per zone,…

Components of Expressway Media Traversal

Proxy Default component used for media traversal Back-to-back user agent(B2BUA) B2BUA is an application invoked by the Proxy that fully terminates a call leg and establishes a new call leg. The call legs are then bridged together and count as different calls. Component used when media encryption policy other than “auto” is applied.B2BUA are of…

Business-to-Business using Expressway

Whats a Business to Business call ? When user place a call outbound from the enterprise to an external video service/customer or receive a call from external video service/customer over the internet its a business-to -business call. How can we make it working? Using Expressway servers we can make this working. Expressway C and E…

Analyzing Debug ISDN Q931

In this blog i explain complete set of messages send between ISP and Gateway for a call made from my mobile to my desk phone extension 399. I did a debug ISDN Q931 on my gateway inorder to capture the messages. Even though a deep level analysis are mostly done by TAC, its always good…

What Is AAA?

AAA stands for authentication, authorization, and accounting. AAA is a framework for intelligently controlling access to computer resources, enforcing policies, auditing usage, and providing the information necessary to bill for services. These processes working in concert are important for effective network management and security. Authentication Authentication provides a method of identifying a user, typically by…

CUCM backup using PCD as a SFTP Server

This blog describes how to use Prime Collaboration Deployment (PCD) as a Secure File Transfer Protocol (SFTP) server in order to provide a remote server option for tasks such as upgrades, backups and restores. Requirements Cisco recommends that you have knowledge of: Cisco Unified Communications Manager (CUCM) version 11.5(1) or later PCD version 11.6(2) or…

Using ACME on Expressway-E

The below is from Cisco Expressway configuration guide. I will be testing this on my lab and will share the screenshots. From X12.5 the Cisco Expressway Series supports the ACME protocol (Automated Certificate Management Environment) which enables automatic certificate signing and deployment to the Cisco Expressway-E from a certificate authority such as Let’s Encrypt. The…

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