(This also works for a CellSocket, Dock-N-Talk™, XLink Cellular Bluetooth Gateway (ITC-BT) or similar device)
This is the original illustrated page on this subject, available online since January 2004 (and considerably expanded since). If you find other pages offering similar information, there's a pretty good chance they used this page as their inspiration!
The following tutorial before I have posted here,I have read it very detail and I certify that this guy know what he is doing,I am a certified Commtech4 from Comcast (Xfinity) ,certified on Service Tech from AT&T,actually working for my own company as Data and voice Tech installer and this info is weighted in gold
The photo that you see to the right was taken from the Internet of a 'self-proclaimed expert' in phone wiring showing an example of his work -- where he incorrectlyuntwisted the pairs.
Dial Prefix: 12122773895
Call Waiting Prefix: *99,,*70,,#019,, (Use *99 only with a Cisco ATA-186 adapter - see below)
Phone Available: Off
Dial Tone Detect: Off
- First, try connecting a phone directly to the VoIP adapter (disconnect the VoIP adapter from your home wiring). If you still hear the radio station, try another phone (also using a different line cord to connect the phone to the VoIP adapter). If you hear the interference no matter what phone and line cord you try, the VoIP adapter itself may be picking up the interference, and you should contact your VoIP provider for assistance.
- Next, try disconnecting all telephones and telephone devices from the line, and leave only the VoIP adapter connected. Then test each telephone individually — you may find that it's only a certain phone that's causing the problem. If so, it may be the phone, or it may be a bad cord on the phone — try replacing the cords (line and handset cord) temporarily before you throw away the phone.
- If that doesn't work, try to trace the inside phone wiring in your home, and look for bad splices or damage to the wiring. In particular, if you find any splices made with unapproved connectors (such as wire nuts), redo them using approved, moisture-resistant connectors. Disconnect wires to jacks you don't use and don't plan on using. If you don't know where a wire goes (if, for example, it disappears into a wall) and you suspect it may no longer be in use, try disconnecting it, at least temporarily (unused wiring can act as an antenna for radio signals).
- The next thing to do is make sure that all connections at terminal blocks and phone jacks are secure. Remove the cover on each phone jack, and tighten each screw a little. Look for obvious signs of corrosion or moisture entering the jack, and if you find any, replace the jack and make sure that you make a good clean connection to the new jack.
- The next thing to try is obtaining one or two capacitors and placing them on the line. A good capacitor to use would be a 0.01µF 400V Metal-film Capacitor (Radio Shack part number 272-1051 or equivalent). You can try one connected directly across the line (that is, from one wire of the pair to the other), or for greater effect you can use two capacitors. If you use two, connect one lead from the first capacitor to one wire of the pair, and the other lead of the capacitor to a good ground. Wire the other capacitor to the other wire of the pair, and to ground. This may be easiest to do if you put the capacitors inside the Network Interface Box, since there is usually a ground wire available in or near the box (VERY IMPORTANT: Do NOT completely disconnect the ground wire from the network interface box, because it helps protect your home from lightning damage!). Be sure to insulate the bare capacitor leads using insulated tubing or (in a pinch) electrical tape, so they cannot come in contact with other metallic parts or wires.
- If capacitors do not work, or if you'd simply prefer an easier (albeit more expensive) method than hooking up capacitors, you can obtain a radio frequency interference filter that plugs into the telephone line cord. You may need to experiment with the placement of these — you may or may not need one at the VoIP adapter, and/or at some or all of the phones in your home. These can be purchased at an AT&T phone center, at Radio Shack(part number 279-151), or online at K-Y Filters, at K-COM, at Sparrevohn Engineering, or at Industrial Communications Engineers (Note that you may need to know what type of radio station is causing the interference to order the proper filter, and some of these filters may work better than others in any given situation).
- If none of the above work, and especially if your home is wired with the older "quad" style wiring, consider rewiring your home using Cat 5 or even Cat 6 wire. The tight twists in the wire pairs may resist radio frequency interference better than the existing wire, and new wiring can bypass "hidden" problems in the old wiring that are not obvious with a visual inspection. In this situation it is extremely important to use only approved connectors for splices, and to make sure that all screw terminal connections are clean and tightened properly.
- If all of the above fails, and you can identify the source of the interference, you may try asking someone associated with the offending transmitter for assistance. They are probably not legally obligated to help you, but may be willing to do so as a goodwill gesture (this may be particularly true if it's a ham radio operator, or nearby broadcast station).
This will generate one second of a "D" touch tone (941 Hz + 1633 Hz) just prior to playing the Off Hook Warning Tone. The "D" tone cannot be generated from a standard 12-button touch tone pad, but can be used directly by some types of equipment as a disconnect signal. If your equipment cannot be directly programmed to release a line upon hearing the "D" tone, you can buy a "DTMF Flash Generator" that should disconnect the line upon hearing the "D" tone (see next paragraph).
- In case you missed it above, in the U.S. and Canada, under Ring and Call Waiting Tone Spec, the Ring Waveform should be set to Sinusoid, the Ring Voltage should be set to 90 and (this is most important) the Ring Frequency to 20 — this not only allows older phones with mechanical bells to work, but it just might help in a few odd cases where Caller ID doesn't seem to work properly on a particular phone. In fact, if you have any weird problems with equipment that worked fine with traditional phone service not working with VoIP, and that equipment is activated by a ring signal, this may be the problem. Linksys and Sipura adapters default to a ring frequency of 25 Hz, which is NOT the frequency usually used in the United States and Canada.
- Under the Control Timer Values (sec) section, we suggest setting the Interdigit Long Timer to 20, especially if you also lengthen the dial tone as explained below (it would probably be a good idea for the Interdigit Long Timer and the Dial Tone to be the same length). Also, as mentioned earlier, we suggest setting CPC Delay to 10 and CPC duration to 1, because if you have one or more phones with a "hold" button and you ever put a call on hold and then no one picks it up, this will release the hold (freeing the phone line) when the caller hangs up. Note this will not help if you accidentally leave an outgoing call on hold — at present the Linksys/Sipura doesn't have any good way to release outgoing calls accidentally left on hold automatically (perhaps Linksys might consider adding this in a future firmware release — it would great if they would add an "Off Hook Warning Disconnect" signal, which would be like a CPC disconnect, except that it would activate just before the Off Hook Warning Tone plays).
- Lengthen the dial tone to 20 seconds (some people find the default 10 seconds too short): Change Call Progress Tones | Dial Tone to 350@-19,440@-19;20(*/0/1+2) — if this results in a dial tone that is too low in volume, change the two instances of @-19 to @-16
- Lengthen Second Dial Tone, Outside Dial Tone, Prompt Tone, Busy Tone, Reorder Tone, MWI Dial Tone, and Cfwd Dial Tone to 20 seconds: These settings, like the basic dial tone mentioned above, are under Call Progress Tones - in all the existing strings find ;10( and change it to ;20(
- Slightly increase the volume of the Call Progress Tones (such as Dial Tone, Second Dial Tone, Outside Dial Tone, Prompt Tone, Busy Tone, Reorder Tone, MWI Dial Tone, and Cfwd Dial Tone): Once again, look under Call Progress Tones - in all the existing strings in that section, find all instances of @-19 (or @-nn where -nn is any negative number less than -16) — note that there will often be more than one instance per line — and change it to @-16 — if that is too loud, try a lower value such as @-17 or @-18 etc., if it is too soft, try a higher value such as @-15 or @-14 etc.
- Left a phone off hook accidentally? Found that the adapter's off hook warning tone borders on pathetic? Here's a much better one. This gives you 30 seconds of warning warble tone followed by 30 seconds of the genuine off hook warning tone used by most phone companies: Change Call Progress Tones | Off Hook Warning Tone to 480@-10,620@-16,1400@0,2060@0,2450@0,2600@0;30(.2/0/1,.2/0/2);30(.1/.1/3+4+5+6)
Note that if you want the off-hook warning to continue indefinitely until the phone is placed back on the hook, rather than shutting off after 30 seconds of the loud tone, use this instead:480@-10,620@-16,1400@0,2060@0,2450@0,2600@0;30(.2/0/1,.2/0/2);*(.1/.1/3+4+5+6)
Also, note that if for some reason you don't want the warning warble (which we highly recommend because it will cause most people to hang up before being blasted with the off-hook warning), you can use1400@0,2060@0,2450@0,2600@0;30(.1/.1/1+2+3+4) or 1400@0,2060@0,2450@0,2600@0;*(.1/.1/1+2+3+4) (the former gives a 30 second warning, the latter lets it go on indefinitely until the phone is placed back on-hook). Obviously, you should not make either of these changes if you made the change to generate the "D" touch tone prior to the Off Hook Warning Tone, as described under "Special considerations for business customers" above.
- If you want a phone to ring for more than one minute (the default before a Sipura adapter returns a 480 "Temporarily not available" code to the switch) then look under Distinctive Ring Patterns at the Ringx Cadence settings (e.g. Ring1 Cadence, Ring2 Cadence ... Ring8 Cadence) and change the number of total seconds, which is the number prior to the left parenthesis. For example, by default, the Ring1 Cadence is set to 60(2/4) which means "60 seconds of ringing, 2 seconds on followed by 4 seconds off." If you change the 60 to a higher value, such as 180, then the line would ring for a longer time (in this case three minutes) before failing the call. Note, however, that this setting will have no effect on any other process that might intercept the call (such as a transfer to voicemail before the timeout ends).
- If the people you are talking to sometimes complain that they hear their own voices echoed back to them, try changing the FXS Port Output Gain to a slightly lower value. For example, if it is currently set to -3, try changing it to -6 or -9. This will lower the volume that you hear in your telephone's receiver so if you set this too low, you'll have difficulty hearing people, which is why we suggest making only small changes. Note that if you have a telephone with a receiver volume control and you have this set on "high", try turning it down to the "normal" setting and see if that fixes the problem first, before you change this value on the adapter.
- If you sometimes hear your own voice echoed back to you, try changing the FXS Port Input Gain to a slightly lower value. For example, if it is currently set to -3, try changing it to -6 or -9. This will lower the volume of your speech going out, so if you set this too low, those you call will have difficulty hearing you, and/or touch tones you enter on your phone's keypad will not be recognized. Unless you are having severe problems with your voice echoing back to you, we don't suggest setting this below about -6.
- If you have an answering machine or similar device that accepts touch tones for control functions, and you find that when you call in and try to use tones to activate the unit it does not respond properly, check under the Miscellaneous section to see what the DTMF Playback Level and the DTMF Playback Length are set to. The default DTMF Playback Level is -10.0 which is often too low, while the default DTMF Playback Length is .1which is very often too short.
- If you are in the United States (and probably Canada) and your location observes Daylight Savings Time, the Daylight Saving Time Rule should be:
Google is your friend for finding the correct rules for other parts of the world. That also applies to things such as Dial and Busy tone frequencies, etc.
- A few people may wish to go into the individual "Line" tabs ("Line 1" and "Line 2") and go to the FXS Port Polarity Configuration section, and set Caller Conn Polarity to Reverse. All this will do for most people is give you an audible "click" when a call you place is connected, and again when the called party hangs up. What it actually happening is that the polarity of the line is reversed when the outgoing call is connected. Some advanced phone systems may be able to use this information to avoid the "line left on hold" problem, but most "hold" buttons on telephones will NOT release just because line polarity reverses (you may be able to build a circuit that responds to polarity reversals and generates a CPC disconnect signal after a polarity reversal). Note that if for some reason you want the line polarity to reverse when you are the called party, then you will need to set the Callee Conn Polarity to Reverse.
- Under the SIP tab, check to make sure that the RTP Packet Size is set to 0.02 (Sipura units) or 0.020 (Linksys units). Linksys has been shipping units with this parameter set to 0.030 by default, and that value is not correct when using the G711u codec (which is what most people use). An incorrect value here can cause choppiness in audio (heard by the person at the other end of the call), or noise or clicks while playing certain recordings.
- This was suggested in a message posted to a thread on BroadbandReports.com that offers several other useful Linksys/Sipura tricks. If your VoIP provider does not offer 911 support, and you have a ten-digit number for your local 911 center that you know is answered 24 hours a day, you may be able to program your adapter to dial that ten-digit number whenever someone dials "911." Go into the individual "Line" tabs ("Line 1" and/or "Line 2") and go to the "Dial Plan:" string. The first character in the string should be a left parenthesis ("("). Immediately AFTER that left parenthesis, insert the following characters IN FRONT OF the characters that are already there:
(The "0" is a zero, not a capital letter "O", and be sure to include the "|" character at the end!). Replace the nnnnnnnnnn with the ten digit number using numeric characters only (no hyphens, etc.). So if, for example, your "Dial Plan:" string originally began with (x#| it should now begin with (<911:1 i="">nnnnnnnnnn911:1>>S0|x#| and again, the nnnnnnnnnn must be replaced by a ten-digit number that rings into your local 911 center that is answered 24 hours a day. Note: If you do this, you and you alone are responsible for making sure it works as intended. If your local 911 center allows test calls (some do and some do not), we strongly urge you to make a test call to be sure that this works as intended. Note that if you are receiving service from a commercial VoIP provider in the United States, they should offer 911 emergency calling as part of the service, in which case you should NOT make this modification.
SOURCE RETRIEVED FROM THE ORIGINAL MICHIGAN GUY AND THE BEST SO FAR