VoIP Blog - Page 853

SaRP is a SIP and RTP proxy designed specifically to handle the problems inherit in NAT and SIP. The current implementation is written in Perl but a cross-platform C++ version is being worked on. Allow hosts behind a…

How to disable the Linux VESA frame buffer Using the X Window System or a VESA Frame Buffer may cause jittery sound. How do you know if you’re using a frame buffer console? Is there a penguin in…

Voice over IP (VoIP) defines a way to carry voice calls over an IP network including the digitization and packetization of the voice streams. IP Telephony utilizes the VoIP standards to create a telephony system where higher level…

How to create callback voicemail by Jpiterak Here are a couple of scripts I use to do callback voicemail to my users. This was a request from a customer who was looking at a similar feature on an…

Asterisk extensions Extensions are where you call in Asterisk. It can be A user A Asterisk cmd Queue Voicemail Voicemail Administration A PSTN connection and much more. A extension can be defined in text or with numbers. Always…

Problem: I just got started with Asterisk and am having a problem with voice quality. When connecting via either a Grandstream IP phone or calling from the PSTN (via Digium 100XP FXO) the demo-congrats msg I get is…

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Synopsis Wait for Ring Application. “This application can help with phantom ringing caused by a noisy FXO line.”(quote taken from the dev mailinglist, stated in a conversation between Marius Stankevičius and Eric “ManxPower” Wieling on 03/26/2007) Description WaitForRing(timeout)…

This is work in progress, brainstorming OpenEnum – global routing of VOIP calls based on numeric input Background reading Read ENUM, Asterisk config enum.conf, Asterisk cmd EnumLookup, SER module enum, Asterisk E164 Call Routing The problem: phones want…

The SIP Express Residential Gateway is an external standalone device that provides cost effective communications or IP Telephony through the internet. It allows to connect two standard analog phone devices like home desktop phones, wireless phones, faxes or…

DNS NAPTR resource records are documented in RFC 2915: This document describes a Domain Name System (DNS) resource record which specifies a regular expression based rewrite rule that, when applied to an existing string, will produce a new…

What is ICE? From draft-ietf-mmusic-ice-19.txt draft: This document describes a protocol for Network Address Translator (NAT) traversal for UDP-based multimedia sessions established with the offer/answer model. This protocol is called Interactive Connectivity Establishment (ICE). ICE makes use of…

nathelper: This is a module to help with NAT traversal. In particular, it helps symmetric UAs that don’t advertise they are symmetric and are not able to determine their public address. fix_nated_contact: rewrites Contact header field with request’s…