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I have an Asterisk 11.5 system, using SIP Realtime and operating as a ITSP. One of my customer's endpoints is a NetVanta 7100 PBX system that has a SIP trunk connection to my Asterisk box. The NV 7100 has a public IP on it that doesn't have any NAT between it and my Asterisk system. When the customer transfers a call from one handset to a voicemail box, the NV 7100 sends a RE-INVITE to Asterisk with SDP informa...

...tember 20, 2005 Time: 10:00 a.m. - 11:00 a.m. Central Daylight Time (CDT) Topics covered in this complimentary 60-minute course include: * Learning how ADTRAN's Internetworking and Integrated Access products can help to enable the migration from a TDM voice solution to a VoIP network * NetVanta's Layer 2 and Layer 3 QoS (Quality of Service) Offerings used to prioritize VoIP traffic * NetVanta's Power over Ethernet Switches used to enable mobility for a VoIP network * ADTRAN's Integrated Access Devices used to migrate TDM to Packet voice networks * ADTRAN's Carrier...

Hi all, For a top quality setup, I will need to install high quality VoIP switches with QoS and PoE. My potential customer should not have any problem with call quality. Experienced folks, Please advice me what switches to install and at what price. I may need it for upto 100 phones. What else should I consider so that phones work without problem along with the computers on the same network?

Hi all, When configuring Asterisk with an ISDN card, it will at one point become necessary to select the LBO (Line Build-Out) value. This is an integer (0-7) that is determined by the length of the cable and is selected from the following table. Many of us are familiar with it: CSU (dB) DSX-1 (feet) ------------------------------- 0 0 0?133 1

...bit of pricing homework a few months ago on new T1 cards. The idea was to build a Linux based router/firewall. After all, Ethernet NICs are easily available for less than $10 today. But all the T1 cards I found cost a fortune. And about a year ago, I learned the list price for a complete Adtran Netvanta 3200 router with T1 card is in the $700 range. Cisco 17xx routers are considerably more expensive. With that kind of cost, I have a difficult time justifying the time and effort to build a Linux T1 router. Am I nuts? Does anyone know of an ongoing supply for low cost and reliable PCI <-->...

I've been asked to assess the cost of implementing Asterisk with a single T1 line in one of our offices. I've had plenty of experience w/ TDM400 cards, but T1 is new for me so a couple of questions: 1) Will I need a digital or analogue interface card? I expect digital is the answer, but the Digium web site said something about analogue cards being able to support "provider T1