tieline

[coniglio]

if I use coordinated dialing between my local office and one of my remote offices must I have a separate tie-line T1 with PRI? Everything is configured in CDP to delete and insert, etc. I was told the reason we got a separate tieline T1 is that we needed a PRI circuit in order to show the phone numbers on each others' phones (we don't use PRI circuits anywhere else and it's necessary that we see each others' caller ID info for these two particular offices). Is this true?

 

[wdhb]

If you want name display etc over a tie line, you must have a d-ch. Your options can be
1/analogue ddi or e&m with an associated ISL d-ch.
2/DTI with associated ISL d-ch
3/PRA (which obviously has it's own d-ch)
4/VNS

what you need to do is work out which option is the cheapest to run.

 

[wdhb]

being a dinosaur, aren't I. Another option is VOIP using ITG cards.

 

[coniglio]

considering i hadn't a clue as to what PRA is (i've only heard of PRI)you're not being a dinosaur. And of course i don't know what an ITG card is but I'll ask my vendor about this. Thanks WDHB.

 

[wdhb]

PRA & PRI are the thing & come in 2 flavours T1 = 24 voice channels & E1 = 30 voice channels. Dpends on which market you are in as to which you get.

DTI is basically a digital version of analogue trunks & uses bit signalling in channel 16 & has 30 voice channels.

An ITG card is Nortels VOIP interface card. It goes in the IPE shelf, so you save on Network shelf capacity & can be used for either trunk side or extn side, (ie IP phones) but you can't mix these 2 functions on the same card. Currently ITG cards are priced at twice the usual exorbitant rate that Nortel charges for it's legacy cards so to use these you normally would need a good business case like toll bypass. Or you could be working for a company that has deep pockets & loves new technology.

 

[coniglio]

so if i route the calls over a regular T1 (not a tieline T1) and that T1 has a D channel will the name and extension show on the far end like it currently does (the calls go out over the tieline and the far end sees the access code 82 plus the 4-digit extension). I am asking because my predecessor said we needed a TIELINE, but i don't think that's so. If our regular T1s had d-channels we could route the calls over them, right?

 

[wdhb]

Not quite,a T1 has a d-ch. Your PSTN T1 d-ch is connected to the PSTN, or LEC or whatever you North American guys call your local exchange. If you want to connect to another of your sites & you want name display etc between the sites then you need a point to point T1, ie doesn't terminate at the LEC, so in this, your predecessor was correct. However, you could use VNS. In this set up you have just a d-ch, over a low speed data connection, can be 2400baud to 64kb. This does all your call setup & call information, like name display etc & the voice call can go over the LEC. You also need a dedicated ddi number block, might be 10 numbers, at each end.
You could also use a seperate d-ch, as in VNS, but use point to point analogue tielines.
VOIP, offers yet another option, in that if you have spare bandwidth, you could put everything through your WAN

All of this depends on your markets pricing & which option does the job for the best price.

 

[coniglio]

thank you wdhb.