For me the only option to get something faster than dial-up is ISDN. I know, it's not great and it's expensive. Be as it may, I have to do with ISDN. I am wondering if it is possible to get VoIP service over the ISDN connection. With ISDN I get the bandwidth associated with the two B channels (128K) which in theory would be plenty for good voice traffic. However, reading the offerings from various VoIP services, they only mention DSL or cable as suitable VoIP avenues. Does any of you guys have VoIP working on an ISDN connection?
VoIP over ISDN
May 19, 2005
6 Replies
Yes, there should be no reason why this can't work. I think the reason you don't hear much about it is that ISDN has become quite uncommon most places.
miguel
Why not use one of the B-Channels for voice? Most ISDN routers can automatically add and drop a B Channel from your data connection when it is needed for voice.
I have some Cisco 804 ISDN routers with 2 pots ports available for sale at a good price if you are interested.
Mike Schumann
Yes, the B channels and the pot ports can be directly used for voice, only however under the supervision/billing of the Telco (as far as I know ....) thus negating the price advantage of the VoIP scheme.
Leo
What is ISDN replaced with?
2B+D is squeezed out by DSL and cable modems.
PRI isn't going anywhere, I should have clarified.
miguel
In Qwest territory, if you have ISDN, voice channels are a freebee. You still have to pay long distance charges (you can use any carrier, just like on an analog line), but local calls are free. Also, the standard price includes most options you can think of (Caller ID, Call Transfer, Call Conference, etc....). It turns out that the ISDN pricing is less than 2 business lines, so it's a relatively good deal just for voice.
Mike Schumann
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