VoIP How to: Voice reinjection: Difference between revisions

(2 intermediate revisions by 2 users not shown)

Line 1:

In BT terminology, Voice Reinjection is the way to route voice signals from a VoIP service onto the existing home telephone wiring.

This will become more common as copper pairs are replaced by optical fibre.

(Though, it's often easier just to use a DECT VoIP phone!)

In the meantime, if you have a copper pair from A&A (i.e. without telephone service on that copper pair) and use VoIP, you

Line 37:

Line 39:

* Gently unclip the 4 plastic clips which retain the circuit board in the outer shell, and lift out the circuit board.

You should now have gone from

You should now have gone from<br />

[[ File: VDSL_SSFP_back.jpg]]

[[ File: VDSL_SSFP_back.jpg]]<br />

to

to<br />

[[ File: VDSL_SSFP_dismantled.jpg]]

Line 54:

Line 56:

This is an untidy solution, and relies on having the right parts to hand.

One needs an ADSL microfilter ~~of the type~~ supplied with modem/routers over the years. It needs to be of the type where the connection to the line is made with a short BT plug to an RJ11 plug (American style) - i.e. the microfilter has two RJ11 sockets on it, and one BT phone socket. One also needs an RJ11 plug to RJ11 plug lead. Remove the existing RJ11 lead from the VDSL SSFP, plug one end of the new RJ11 lead into the VDSL SSFP, and the other end into the 'line' connection of the microfilter. Now plug the free end of the old RJ11 lead into the microfilter, and ensure the modem/router regains sync. Now the phone socket on the microfilter is connected to the copper pair.

One needs an ADSL microfilter as supplied with modem/routers over the years. It needs to be of the type where the connection to the line is made with a short BT plug to an RJ11 plug (American style) - i.e. the microfilter has two RJ11 sockets on it, and one BT phone socket. One also needs an ''appropriate'' RJ11 plug to RJ11 plug lead. Remove the existing RJ11 lead from the VDSL SSFP, plug one end of the new RJ11 lead into the VDSL SSFP, and the other end into the 'line' connection of the microfilter. Now plug the free end of the old RJ11 lead into the microfilter, and ensure the modem/router regains sync. Now the phone socket on the microfilter is connected to the copper pair.

There ~~are~~ a ~~few gotchas~~ regarding the wiring of RJ11 sockets. The VDSL SSFP uses pair 1 (pins 3 and 4) on the connection for the modem/router. I have ~~the~~ ~~odd~~ ~~microfilter~~ ~~where~~ the RJ11 (or RJ14 ?) line socket ~~uses~~ pair 2 (pins 2 and 5) instead (although the RJ11 out to the modem/router is wired as pair 1), so one ~~would need~~ a crossover RJ11/14 cable between the VDSL SSFP and the microfilter. It's easier if one has a box of spare microfilters and leads...

There is a gotcha regarding the wiring of RJ11 sockets. The VDSL SSFP uses pair 1 (pins 3 and 4) on the connection for the modem/router. I have two suitable microfilters, but they both have the RJ11 (or RJ14 ?) line socket wired using pair 2 (pins 2 and 5) instead (although the RJ11 out to the modem/router is wired as pair 1), so one needs a crossover RJ11/14 cable between the VDSL SSFP and the microfilter. It's easier if one has a box of spare microfilters and leads... the crossover cable would need to wire pin 2 at one end to pin 3 at the other end, 3 to 2, 4 to 5, and 5 to 4.

== Earlier NTE5 with MK3 VDSL Interstitial faceplate ==