AdamBCohen
Technical User
My question is the following about att voip: If you have an alarm system can you have it connected to voip? And if you can not why?
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att call advantage and security 1
- Thread starter AdamBCohen
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computerhighguy
IS-IT--Management
The short answer is typically no. The problem resides in the way VoIP works. Lets first examine at a high level how a modem works. Modems use different tones to represent 0s and 1s (and also combinations of 0s and 1s). During trainup. the modems synchronize and negotiate a speed that the end to end line will support (due to quality issues, noise, etc).
VoIP isn't a continuous stream of data. It actualy samples the sound (around 20 ms), converts, encapsulates and sends. VoIP does not guarantee, nor does it need, all the packets to arrive at the destination. It also does not need them to arrive necessarily in the same order (keep in mind there are limitations to the amount of lost packets and out of order packets most VoIP system can handle). The goal with VoIP is to have calls clear to the human ear.
Your standard analog call is 64Kbs. The G711 codec is also 64Kbs before packet overhead (about 90K after overhead), but is still encoding and decoding the sounds on the voice stream. It is not meant, nor does it have knowledge, of modem tones.
Most VoIP providers can provide a FAX line. It uses a different codec technology that knows about modem tones up to 14.4Kbs (typically). It also costs more because of the technology and bandwidth requirements. Depending on how your security system is setup to communicate, you may be able to get one of these FAX lines and have your security system use it. However, I wouldn't suggest that. A standard POTS line is not very expensive and should be utilized on a security system. I usually recommend no features on it, especially if the security system is
dialing a toll free number.
I want you to keep in mind that I simplified a lot of what I explained in here so that hopefully most people can understand. It actually is a bitmore complicated, technically, than what I have conveyed here.
It is what it is!!
__________________________________
A+, Net+, I-Net+, Certified Web Master, MCP, MCSA, MCSE, CCNA, CCDA, and few others (I got bored one day)
VoIP isn't a continuous stream of data. It actualy samples the sound (around 20 ms), converts, encapsulates and sends. VoIP does not guarantee, nor does it need, all the packets to arrive at the destination. It also does not need them to arrive necessarily in the same order (keep in mind there are limitations to the amount of lost packets and out of order packets most VoIP system can handle). The goal with VoIP is to have calls clear to the human ear.
Your standard analog call is 64Kbs. The G711 codec is also 64Kbs before packet overhead (about 90K after overhead), but is still encoding and decoding the sounds on the voice stream. It is not meant, nor does it have knowledge, of modem tones.
Most VoIP providers can provide a FAX line. It uses a different codec technology that knows about modem tones up to 14.4Kbs (typically). It also costs more because of the technology and bandwidth requirements. Depending on how your security system is setup to communicate, you may be able to get one of these FAX lines and have your security system use it. However, I wouldn't suggest that. A standard POTS line is not very expensive and should be utilized on a security system. I usually recommend no features on it, especially if the security system is
dialing a toll free number.
I want you to keep in mind that I simplified a lot of what I explained in here so that hopefully most people can understand. It actually is a bitmore complicated, technically, than what I have conveyed here.
It is what it is!!
__________________________________
A+, Net+, I-Net+, Certified Web Master, MCP, MCSA, MCSE, CCNA, CCDA, and few others (I got bored one day)
- Thread starter
- #3
AdamBCohen
Technical User
Thank you for responding to my question. I will try it on a VoIP line with fax and see what happens. Again I do appreciate.
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