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4.3.1. PRI's for asterisk

1.1. PRI

PRI is an abbreviation for Primary Rate Interface and is a telecommunication standard for carrying multiple data or voice DS0 transmissions between 2 physical locations.

All data and voice channels are (ISDN) and operate at 64 kbit/s.

North America and Japan use a T1 of 23 B channels and one D channel. Europe, Australia and most of the rest of the world use a slightly higher capacity E1 of 30 B channels and one D channel.

A B-channel is used to transmit the voice or data and is sometimes also called a user channel, a D channel is used for control messages and signalling.

In some T1 configurations, no D-channels might be used, instead the signalling will be sent inband over the B channels, this is called in-band signalling or bit robbing, resulting in lower transmission rates than the E-carrier system. This resulted in many US ISDN installations only having an effective data rate of 56 kbit/s over a nominal 64 kbit/s channel. See also A&B. This depends on the framing format used.

In the states its common to order a fractional T1, with less than 23 B channels.


1.3. signalling

On both E1 and T1, one timeslot is usually reserved for a D-channel for call setup and call teardown. (called signalling).

- CAS: Channel associated Signalling: with this kind of signalling, a set of bits is used to replicate opening and closing the circuit (as if picking up the telephone receiver and pulsing digits on a rotary phone), or using tone signalling which is passed through on the voice circuits themselves.

- CCS: Common Channel signalling: A more recent kind of signalling, (ISDN signalling and ss7 signalling are a subgroup of CCS signalling.) In this kind of signalling, short messages are sent over the signalling channel, with more information about the call, including caller ID, type of transmission required, etc. etc.





1.4. Framing

- HDB3
- AMI: Aternate Mark Inversion
- B8ZS:



1.5. Timing or clock sources

A PRI connection needs a timing device on one of both ends.
A PRI line can be clocked internally or can be clocked by the telco.

See more about this in the zaptel pri howto.



pridialplan=dynamic
<neonet2006> I am trying to terminate on a gateway (hooked up to a PRI) the PRI provider needs to see specific ton and npi
<neonet2006> national/isdn


references:

PRI on wikipedia
E1 on wikipedia
HDB3 signalling on wikipedia
B8ZS on wikipedia
T1 on wikipedia
ISDN on wikipedia
E&M on wikipedia
AMI framing on wikipedia

 
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Dear Sir,

I am working at a government organization in Pakistan and we are currently using meridian option 11c for voice over ip, we have also set up asterisk and want to be able to communicate between the two servers. I would be grateful if you could help me out with the hardware required for asterisk to make it communicate with nortel meridian option 11c, we have already bought t110p card by digium but it doesnt seem to sync.

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Venigjar BEGAJ (vbegaj at dimal dot com dot al)
19 March 2006 15:02:52

Dear Sir

We thank you for the information that you have sent to us.

Im sending the responses to your questions.

a.We intend to use all of your types of callback.
b.2000 customers
c.We hope that you could give us the best solution in a lower cost.If there is any way that we could use our existing hardware please let us know.
d.We don't have an intended network diagram so you could give us a solution.f.We intend to launch these services as soon as possible.


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Dear Sir
Here is what equipments we have.


Our current platform consist Iskratel SI2000 SS7 PSTN , Tenor CMS960 , DX2030, Gatekeeper, Call Relay, Eurotech PRI GSM and Alepo Billing System RBS VOIP.

We have a 2 Dell Poweredge 2800 server with Linux Red Hat Enterprise 4. We have a 2 Dell Poweredge 1800 server with Linux Red Hat Enterprise 4. We have a Supermicro P4SC8 3GHZ, with Windows 2003 Server.


What we want:

We are currently working with a partner carrier for termination and origination.

We would like to offer callback services SMS, Web,ANI etc and in a latter period PC to Pc and PC to Phone services integrated with our current equipments.

Can you explain us in what this solution consist such as equipment needed and how can it be implemented to our platform and please give us a total techinchal solution and the costs for that.

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CEO
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