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.
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
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Ahmed Jilani (ahmedjilani at nadra dot gov dot pk) 21 June 2006 13:42:16 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.
Thank You
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Dear Sir
We thank you for the information that you have sent to us.
Im sending the responses to your questions.
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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
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We greet you another time and hope in a very good offer, techincally and economically.
Best Regards
CEO
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Interested in Design & Development of PCI Card for IVR Application.
My query is How to test for CAPI Compliance on your softwares.
With regards,
Iftekhar
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