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| 07:57.00 | wedhorn | snuff-work: it's Sunday evening, what are you doing???? |
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| 18:21.12 | *** join/#asterisk-dev kam187 (~kam187@87-194-204-58.bethere.co.uk) |
| 18:21.14 | kam187 | hey guys |
| 18:21.31 | kam187 | anyone ever done any sort of ring detection code before? |
| 18:21.53 | kam187 | ideally i don't want to rely on cadence because it'll take too long to know its ringing |
| 18:22.09 | kam187 | i'd rather sample the pcm and check the frequencies |
| 18:22.46 | Corydon76-work | kam187: you mean for analog lines? |
| 18:22.54 | kam187 | yeah |
| 18:23.17 | Corydon76-work | Wouldn't it just be easier to check that at the hardware level (i.e. AC instead of DC)? |
| 18:23.36 | kam187 | actually i've written a channel driver which interfaces to a GSM modem |
| 18:23.47 | kam187 | i get PCM audio out of it, but no sure fire indication of ringing |
| 18:24.15 | WIMPy | Define "GSM modem". |
| 18:24.28 | kam187 | its a qualcomm module |
| 18:24.41 | Corydon76-work | Now you're talking about a digital circuit, not analog |
| 18:24.44 | WIMPy | Not some sort of gateway? |
| 18:25.01 | Corydon76-work | and digital circuits have direct signaling of a call |
| 18:25.04 | kam187 | it probably will be a gateway when i'm finished |
| 18:25.21 | WIMPy | With what? |
| 18:25.40 | WIMPy | So far your question doesn't make much sense. |
| 18:25.44 | kam187 | ok i'll start again :) |
| 18:25.46 | WIMPy | There is no ringing and no PCM. |
| 18:26.11 | kam187 | so technically over GSM it would work with ISDN signalling |
| 18:26.20 | kam187 | but the termination is analog, so signalling is inband |
| 18:26.43 | kam187 | i have a PCM stream of the inband audio at my channel driver |
| 18:26.46 | WIMPy | So it IS a gateway? |
| 18:27.03 | kam187 | right now its one module, but yeah it will be a gateway |
| 18:27.08 | WIMPy | And it's not ISDN, but similar, yes. |
| 18:27.17 | kam187 | WIMPy: yeah exactly |
| 18:27.21 | WIMPy | If you've go analog signals it is a gateway. |
| 18:27.40 | kam187 | right |
| 18:27.54 | WIMPy | I've never seen a module with anything analog except for the radio. |
| 18:28.27 | WIMPy | Why don't you just use the GSM module without the analog stuff? |
| 18:28.32 | kam187 | no, its digital PCM, but what i'm saying is the GSM provider interfaces to some crappy termination which doesn't pass signalling back |
| 18:29.08 | WIMPy | What end are you talking about? |
| 18:29.18 | Corydon76-work | What are you trying to do that you need to detect this? |
| 18:29.30 | kam187 | well imagine you're mobile phone calls your friend |
| 18:29.47 | kam187 | it should ring, then connect, then return a cause code |
| 18:30.10 | WIMPy | With the first two parts being optional. |
| 18:30.15 | kam187 | your phone might show one screen while ringing another while connected and a third with the type of hangup cause |
| 18:30.21 | kam187 | yep |
| 18:30.31 | kam187 | so, in this case it connects immedietly, and rings inband |
| 18:31.02 | kam187 | so i sampled the PCM and used cadence to check for ringing, busy etc, but its not ideal |
| 18:31.20 | Corydon76-work | It's never going to be ideal |
| 18:31.28 | kam187 | i need about 2 cycles to be sure its ringing |
| 18:31.33 | kam187 | yeah i don't expect it to be 100% |
| 18:31.36 | WIMPy | Use a carrier that isn;t broken. |
| 18:31.55 | kam187 | well i don't care about the carier, but i would like to try to handle broken carriers |
| 18:31.59 | Corydon76-work | and depending upon the far end ringer, it's just about impossible to reliably detect ringing |
| 18:32.31 | WIMPy | Sounds like you got as far as you can. |
| 18:32.36 | Corydon76-work | You've got many different possible tones, not to mention some cellphone carriers play music in lieu of ringing |
| 18:33.21 | kam187 | yeah, i understand that, i dont mind it having to be configured, and dropping ones its not sure about |
| 18:33.52 | Corydon76-work | And you can't even use the standard greeting of "Hello" to make the transition, because there are some who answer with "Talk to me" or "So-and-so, inc. May I help you?" |
| 18:34.45 | kam187 | well i was thinking frequency analysis, and if there are one (or two) unqique frequencies within say a 10% tolerance which have a much higher amplitude than any others, its probably a ring/busy tone |
| 18:34.53 | Corydon76-work | The issue is that the sounds you get are entirely destination-based, not originating carrier-based. |
| 18:35.52 | Corydon76-work | Especially when you're dealing with GSM phones, the ringing tone is often the same amplitude as the person answering, and there are practical considerations why this is so. |
| 18:36.13 | kam187 | yeah, thats why i'm thinking frequency based makes more sense |
| 18:36.27 | Corydon76-work | See music in lieu of ringing. |
| 18:37.03 | kam187 | yeah, but in that case, there would probably be more than 2 frequenices at high aplitudes |
| 18:37.49 | Corydon76-work | I think you need to give up. There's simply no reliable, consistent way to do this with only analog signaling |
| 18:38.29 | Corydon76-work | If you try to do something different, you are going to get an endless supply of bug reports, where "I called so-and-so, and the display didn't change properly" |
| 18:39.12 | kam187 | well i'll try to get frequency domain data out of some samples and see what happens |
| 18:39.18 | kam187 | but yeah it'll just be a best effort thing |
| 18:39.21 | kam187 | zero support |
| 18:39.26 | kam187 | (famous last words lol) |
| 18:39.45 | Corydon76-work | Yeah, exactly. How exactly do you tell your CEO that there's no support for this? |
| 18:40.04 | Corydon76-work | No support to him means you'll drop everything and fix it for his phone |
| 18:40.17 | Corydon76-work | Or his buddy's phone... |
| 18:40.22 | Corydon76-work | Or his wife's phone... |
| 18:40.30 | kam187 | lol |
| 18:40.40 | Corydon76-work | Or this really important customer's phones |
| 19:00.05 | kam187 | i'll trying using the Goertzel on a few fixed frequencies i think and see how that goes |
| 19:20.32 | kam187 | geez how hard is it to find a doc on world RBT's |
| 19:23.31 | kam187 | ahh asterisk indications file :) |
| 19:41.25 | kam187 | 8 frequencies covers them all |
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| 20:12.07 | kam187 | seems there's progress detection already using the exact same method in dsp.c! |
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