TMSZ · HackerTrans

TMSZ

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3 lata temudiscuss

It would be more proper to compare baresip to PJSIP/pjsua. I'm using both and both are great, with multiple unique features. The strong point for pjsip would be in my opinion pjmedia conference bridge (easy to use and powerful mixing, volume control, audio format conversion), this basically has no equivalent in baresip. I also do like PJSIP layered project code organization more. On the other hand baresip is slightly ligher in terms of memory usage (more suitable for e.g. STM32F4). And while PJSIP licensing is not that expensive (considering the size and maturity of the project), baresip would be free most of the times even in commercial projects thanks to BSD license.

4 lata temudiscuss

Well, consumer SIP is mostly dead. 20 years ago mobile calls were quite expensive, now they are basically free. Also the marked matured, people are more educated in general and using default port was never a good idea.

4 lata temudiscuss

V.23 FSK is just the name of modulation. You can have CLIP receiver as separate IC (https://www.microsemi.com/product-directory/caller-id/4305-m...) or as some DFT code with Goertzel algorithm with maybe 0.1 MIPS DSP budget allowed. No sane person would add full modem capabilities to this.

That said, PABXs I worked with have built-in software modems (both POTS and ISDN, needs to be explicitely enabled) with remote management capability and there is also dedicated web portal for management even if device is behind NAT (paid feature). Whether you want to trust hardware/software you have no control of - that's another story. For "big" PABXs partnership between manufacturer and installers usually lasts for years.

4 lata temudiscuss

The other caveat is that time spent configuring, troubleshooting and later maintaining them would be worth much more than 10 dollars. Their use is discouraged by many SIP providers (https://teamhelp.sipgate.co.uk/hc/en-gb/articles/204210961-C...) and they have multiple issues not obvious at first glance, like limited character set for Display Name. This might be worth though for 100+ phones in a single location.

4 lata temudiscuss

I remember these phones had some interoperability issue: https://answers.microsoft.com/en-us/mobiledevices/forum/all/... (technically all according to specification, but often not working for incoming calls). At the time Symbian was supported by pjsip though.

4 lata temudiscuss

I do believe that Cisco SIP implementation in 7000 series phones is non-interoperable by design. One major issue is that they are sending SIP messages from different port than the port they are receiving on. Because of this they practically do not work with any kind of NAT and I haven't heard of any consumer service provider that would work with this (the standard behavior is to assume that port passed in Contact line might be incorrect). Some of phones from that line have "NAT" true/false setting, but some don't - when tracing changelog I saw that this setting was removed in later firmware version, but for many phones this earlier firmware version was never available.

4 lata temudiscuss

There are some USB "phones" - basically composite USB devices with audio and HID, where HID is used to handle keypad and display (if present). I'm using very cheap EX-03 "Skype" phone: https://tomeko.net/software/SIPclient/EX03.php but similar devices are also made by big brands, they are just more expensive (Polycom CX300, Plantronics Calisto, Yealink MP50 maybe?) and probably undocumented.

9 lat temudiscuss

I think Delphi Started has same limitation as C++ Builder Starter - removed most of debugging functionality (e.g. local variables window). It may be not critical with small applications, but I would rather have "no commercial", no 3rd party components or code size limitation than crippled IDE. I've tried to switch from Turbo C++ Explorer 2006 (this was also free version) to C++ Builder 10.1 Starter and I prefer old one.

9 lat temudiscuss

Not necessary much higher. I've measured screen flickering in Lenovo T500 (probably one of the oldest laptops with LED backlight) with small solar cell and oscilloscope and it's 220Hz, with lowest brightness setting only 100Hz (although this brighness level is not too useful): http://commonemitter.blogspot.com/2017/06/lenovo-t500-measur...

10 lat temudiscuss

> Very few SoCs have internal switch mode controllers.

That's why PMUs are used. Just look at bottom side of the PCB - there are three coils, two of them very close to the chip looking pretty much like PMU.

> It is going to either be an LDO, or take a fixed operating voltage.

No, read specification: 3.6 - 6V.

10 lat temudiscuss

Nope. There is chip looking like PMU on board with at least two output power rails. For VoCore 1 there were two MT3410L converters, one for 3.3V and one for 1.8V. With switching converter total power consumption should be close to SoC power consumption, not depending on input voltage.

Also specification is pretty clear: 74mA wifi standby, 230mA wifi full speed, 5V input. Input voltage range: 3.6V ~ 6.0V.

10 lat temudiscuss

Code::Blocks was fine for me, simple and lightweight, included in many distros and suitable for cross-platform Windows/Linux work. Also: KDevelop, Eclipse, Netbeans.

10 lat temudiscuss

With a piece of kynar wire same pin can be connected on "old" ESP-01. Little hard to solder though.

10 lat temudiscuss

ESP8266 has ADC. It does not have DAC, however for some purposes (e.g. low quality audio over WiFi) I2S output can be used with DMA as PWM output. Isn't IPv6 supported for ESP8266 with lwip?

10 lat temudiscuss

There are few viewers/editors listed at http://softwarerecs.stackexchange.com/questions/18839/json-v...

JSONedit should work well with files up to few MBs, with larger files loading time may be not acceptable. Side note: for editors that generate structured view file size may be not precise metric - number of elements might work better.

10 lat temudiscuss

There are few ways of inserting comments: http://stackoverflow.com/questions/244777/can-i-use-comments...

If you do not care too much about exchanging data with other apps then parser/generator supporting javascript style comments (e.g. json-cpp) would work. With each JSON value it can store "commentBefore" and "commentAfter". If you need you can strip these comments any time by parse + write cycle with "collectComments" option inactive.

10 lat temudiscuss

I hope this would be JSONedit as it is mine ;) - http://tomeko.net/software/JSONedit/ There are also - I think two different - plugins for Notepad++, JsonViewer: https://jsonviewer.codeplex.com/, commercial: XMLSpy and JSONBuddy and one or two half-baked projects on codeproject.

10 lat temudiscuss

Different uses I guess. I'm using JSON for configuration purposes (~100kB...4MB PABX config, but Azure seems to be more popular example) and it's read-modify-update cycle > 95% of the time.

10 lat temudiscuss

(Emacs) That's weird. Smart editor should render only portion visible to user and number of lines should not make any difference for highlighter. I've checked Scintilla with 3MB single-line JSON and using C++ lexer (actually: "Lexer for C++, C, Java, and JavaScript") and it has no problems except for some lack of fluency when scrolling horizontally.

11 lat temudiscuss

JSONedit has (experimental) C++ code generator that serializes and deserializes JSON to/from object (default name for class is "Settings" and it uses json-cpp 0.5 as parser and generator): http://tomeko.net/software/JSONedit/cpp_class_generator.php