Featured »
3CX Phone System 10 Service Pack 5
December 7, 2011 – 6:58 pm | 16 Comments

3CX is pleased to announce a new release of 3CX Phone System 10, build 22686. Service Pack 5 fixes numerous 3CX Wallboard issues and also adds a new and important caller ID feature. To download …

Read the full story »
Releases

3CX Product Releases

VoIP How To

Technical tips to run your VoIP PBX more efficiently

Events

3CX Trainings and Webinars around the world

Docs & FAQ

3CX Documentation how to and FAQ

Phone configuration

3CX, Aastra, Cisco, Yealink, Grandstream, Polycom configs

Home » Archive by Tags

Articles tagged with: RTP

VIDEO: General SIP and RTP Overview
May 4, 2011 – 5:31 pm | Comments Off

Skills Covered by this Module

What is SIP
What is RTP
How calls are setup using SIP Message exchanges

Firewall Configuration Overview for 3CX PhoneSystem
March 29, 2010 – 2:57 pm | Comments Off
Firewall Configuration Overview for 3CX PhoneSystem

In order for 3CX Phone System to communicate successfully with VoIP providers and Remote Extensions, your firewall/router device must be configured for SIP operation. To maximize your chances of success, make sure you choose a …

SIP messages explained
March 5, 2010 – 4:17 pm | One Comment

All SIP Phone calls consist of 2 channels:

Messaging – SIP
Media – RTP

Messaging is carried using UDP or TCP (normally UDP) SIP packets – It is used for device registration, call setup/teardown, on-hold notification, call …

VIDEO: Introduction to SIP & RTP
November 26, 2008 – 9:56 pm | One Comment

This video is a high level overview to SIP & RTP – explains the basics of the protocols in a 4 minute video