www.footnotess7.com is now open to begin the creation of SS7 that can be used with asterisk.
Sign up and list which and what parts you would like to work on. Race V. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Welter Sent: Sunday, June 12, 2005 1:07 PM To: [EMAIL PROTECTED]; Commercial and Business-Oriented Asterisk Discussion Subject: Re: [Asterisk-biz] E1 with SS7 signaling Christian Savinovich wrote: > > Francisco: > > Can you help me understand this :) ?. > > I am used to think one port with 24/30 channels, maybe one port doing signaling (E1). That's the way the Digium port will work. How does that differs from the SS7 port level, are they receiving the same number of channels? Is it like channel 16 (on an E1) sends the messaging to an out of band channel on the SS7 port, and if so, what channel is that? if there are 30 channels on the digium port, will the SS7 port handle 30 conversations? > I keep thinking one Digium port to one SS7 port, since that's all I need. And finally, are all SS7 ports compatible?, or are there "implementations"?, if so, how the heck am I going to know if what I am paying for will work? > As I understand it: An E-1 circuit (2.048Kbps total) is divided into 32 64,000bps channels. Channel 0 is reserved for framing and synchronization, and channel 16 is reserved for signaling, leaving 30 channels for voice. Channel 16 _may_ be used for channel associated signaling (CAS) information. Each E-1 from Hondutel will have 30 voice channels. There is a V.35 data connection, separate from the E-1 circuits, that carries SS7 messaging between Hondutel and the customer. All call setup and teardown (the signaling) for all the E-1 circuits is sent over this data connection using SS7-defined messages. This differs from a T-1 PRI circuit here in North America. Each T-1 has 24 64,000bps channels. The 24th channel (the "dchan") is reserved or signaling, leaving 23 voice channels. The signaling takes the form of ISDN q.921 and q.931 messages using the HDLC protocol. The signaling for each T-1 is carried in channel 24 of that circuit. What I'm looking for is an adapter device that will allow me connect multiple Hondutel E-1 circuits, along with the V.35 signaling circuit, to one or more Asterisk systems. An ideal configuration would be a device that connects to Hondutel E-1/SS7 circuits on one side and an Asterisk system using a DS3 interface (this assumes the Digium DS3000P card becomes available in the near future). A practical configuration would be a device that connects with Hondutel E-1/SS7 circuits on one side and E-1/ISDN PRI circuits on the Asterisk side (converts the common channel SS7 signaling to ISDN PRI signaling on each E-1 circuit). Another practical configuration would be a device that connects with Hondutel E-1/SS7 circuits on one side and SIP/RTP IP on the Asterisk side. I know there are Enterprise solutions, but the cost is in the $20-80K range. Thanks for your input. _______________________________________________ Asterisk-Biz mailing list Asterisk-Biz@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-biz _______________________________________________ Asterisk-Biz mailing list Asterisk-Biz@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-biz