Bell 202 is a type of modem (half duplex, or asymmetric speed, 1200 baud, in primary direction, FSK, similar to V.23). The Bellcore caller ID standard uses that modem specification for the actual tones. GR30 will be the document that defines the full caller ID system. It looks like it is pre-WWW and doesn’t look like anyone has scanned it in and indexed it. GR30 is being used as technical identification of the North American standard for caller ID.
etsi-fsk is also a technical identifier, and will be based on V.23 modems.
Your other thread Retrieve sip credential from Telnor/Telmex alg modem/router - Providers - FreePBX Community Forums implies that you already have such a situation. Most countries are abandoning analogue phone lines, but quite often the customer premises equipment is locked down, so, although internally VoIP, only the analogue interface is supported. UK was scheduled to complete this in 2025, and I think the USA, and most other countries are on a similar track.
Signal quality can be affected by several other settings, e.g. impedance and gain. A proper vendor would know the settings for a particular market. To really understand what is happening with the signalling, you would need a multi channel digital storage oscilloscope, on the analogue line. Single channel may be enough, but sometimes signalling is relative to earth, not just the other wire.
In countries that permit this, the preference would be to port the analogue phone number to a VoIP provider and access the provider directly over the internet. This can be difficult, if the phone number is associated with an ADSL line, as moving the number may cause the internet service to be removed. Part of the changes. in the UK, in making the network VoIP, are to break the connection between the ADSL line account and the phone number. I assume other countries do something similar.
Actually, it looks like the real problem is that it is an extremely expensive document. I’m seeing prices of USD 455. In practice that means very few companies will have actually read it and most people will be claiming compliance based on upstream claims.
in my case (Mexico country), the main operator runs the services to customers using fiber, but in the house or business they install a modem, this modem converts the sip call to analog, and you connect your analog phone to a rj11 port that is on the modem. But I wonder why caller id works flawless if I use an analog phone connected directly to the modem, I am thinking that it could be a bug with the vega (hopefully it works with the cisco spa 8800)
Ok, so it can be that Bell 202 is just a modern adaptation of GR30, and if my vegea gateway says that it supports GR30 is too generic to assure that it will work on Bell202 too?
Some weeks ago I considered to just use a sip trunk and I did some shopping for carriers that have coverage of my area code, and all of them only offer big packages with maaaany DID’s, And of course I consider it expensive, they don’t offer a 1-2 DID sip trunk which is what I need at this moment.
Some people knows how to extract the SIP credentials and destination ip address from their modem, but that can stop working at any time if the ISP decides to make changes on the sip configuration, I would like to have some equipment that works most of the time even if SIP parameters change from the ISP, my modem will still give an analog line out of that and I can trunk that to my Asterisk using a good fxo gateway, that is my ultimate goal.
In my experience, such companies will buy equipment that is specified as complying, but will test it against the specification, so they will have no need for the document. At least that is how many companies work with standards documents. One of the reasons such documents are so expensive is that almost nobody buys them. In the UK, for example, only BT were involved in research and development. The other telecoms operators just bought in equipment.
As the new information you have posted, it observed Caller ID is provide by the Huawei HG8245Q2, so it’s a Huawei issue (what kind of Caller ID FSK modulation POTS ports support) unfortunately on internet search there isn’t information about Caller ID POTS specs, only indicates;
