Routing VOIP calls out through POTS 1

[saintmike2]

My company has both an London office and a Chicago office that uses Voice over IP to communicate between offices. We use a Nortel E&M/DISA card in the PBX (Model # NT5B38GA) and a Cisco 2620 to do so. The question is; is it possible to configure the system so that when London makes a call to any Chicago number, it get's routed through the Voice over IP line and out of the Chicago PBX? THat way it's only a local Chicago call as opposed to a long distance call? Any help/suggestions would be greatly appreciated.

Thanks,

Mike

 

[iptuser]

I pursume you already have calls going across the IP network Ext to ext? Is is just Chicago calls or all of the US
All US

Create a DMI of del 2 insert 9- outside AC code in the US
If is a local Chicago number then you may need to delete the area code as well.

Create a RLI for the VOIP link
Assign the new DMI as above to this RLI

Create a new SPN for the US only 001 or better

Change spn 00
rtn
rtn
until you get to SDRR enter ARRN
ARRN enter 1
ARLI enter the RLI which you just created

If its just Chicago then you may need to create a separate SPN of 001 and then use SDRR for the local Chicago area code

LD 90
REQ NEW
TYPE NET
TRANS AC1 if you dial AC1
TYPE SPN
SPN 001
RLI - enter the normal RLI for inetrnational calls
FLEN 0
SDRR arrn
arrn enter the Chicago are code
arli enter the new RLI as above


You should now be able to make calls though you may need to check the US PABX for TRK to TRK allow

LD 15
TYPE NET_DATA
TRNX YES
EXTT YES


The call should now go to the US with a "9" infront 1xxx xxxxx


wayne

 

[saintmike2]

<snip>
I pursume you already have calls going across the IP network Ext to ext? Is is just Chicago calls or all of the US All US
</snip>

Yeah, currently you have to dial an extension (like 501) to get over to London and vice versa. Ideally we would like to set it up so that if you just dial the number of an office (such as 01144207xxxxxx) it automatically gets routed over VOIP if there is a free E&M port otherwise it dials out via POTS, seemlessly.

I am playing with the notion of doing long distance dialing via the whichever office is cheaper. So if you are in Chicago and call Europe it would be cheaper if the call was router through the London Office. And the same goes for calls to the US from the London Office.

I have another question relating to this subject. What type of bandwitch consumption am I looking at for a four channel VOIP connection. At a frequency of 20ms it should be around 96kbs but is this realistic? Will the line quality suck?

Thanks,

Mike

 

[iptuser]

Mike,

We used 8 kps compression- G729A but it depends on the latency of the WAN link and what you are prepared to use for voice. Most VOIP companies will tend to use G729A 8 kps due to bandwidth restrictions

Overclw to PSTN

Just add another entry in your VOIP RLI
Entry 1
route PSTN
DMI - create a new DMI to insert the full PSTN number


wayne

 

[saintmike2]

Thanks that was very helpful. I know who to come to if I have anymore queries.

Mike