SIP Protocol

  Connect the lan cable from ONT to your laptop Goto "View Network Connections" Now goto "Ethernet connection" -> "Status" -> "Details" In this you check IPv4 Gateway IP(I got 192.168.1.254) and set mask as 255.255.0.0 Open 192.168.1.254 in browser goto Software Upgrade option Download the image from path http://135.251.205.50/IMAGE/BBDR2104OpenWrtB/ BBD_2104H.508.tar download it Now extract this tar you will get multiple builds inside check AONT SW Strategy page for checking which built you need for hardware Now check http://fn-cm.sbell.com.cn/wiki/index.php/AONT:_SW_image_Strategy#SW_image_name_Strategy (for your device image) Now upload your image(3FE49544IJIL08) in "Software upgrade" option goto 192.168.1.254 username: AdminGPON password: ALC#FGU for shell password generation(goto https://dhbusec2.china.nsn-net.net/DHBUsec/ckp_handling.php?ckp=home&saml_ru=1 -> CLI 2nd level Password to enter Shell (ALU02335783)) Cortin...

  Measuring VoIP Quality with SIP and RTP (catchpoint.com) rx gain, tx gain, slic gain companding DCProfile 1. A SIP-channel only patch that works for alaw/ulaw (a bit of a kludge) 2. A technology independent patch that works for all codecs[1] that adds a SetGains(txgain,rxgain) function for adjusting incoming channels, and adds a V(txgain:rxgain) flag to Dial() for outgoing channels (much less of a kludge). Range extenders - nordicsemi.com

 https://www.tech-invite.com/fo-sip/tinv-fo-sip-service-11.html https://www.dialogic.com/webhelp/img1010/10.5.3/webhelp/description/sip/sip_3pcc_call_flows.htm

 Issue is  Why the G240W-B ONT is not registered in the Sip server? Not able to see REGISTER message itself on SIP traces Solution: Issue can be in DHCP, DNS server, IPv4/IPv6 or PPPoE server Try to check with traces for PPPoE in this case

 https://en.wikipedia.org/wiki/Echo_suppression_and_cancellation https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms Telecordia Standards like    GR-283-CORE pulse timer - https://www.wisdomjobs.com/e-university/programmable-logic-controllers-tutorial-523/pulse-timers-14725.html#:~:text=Pulse%20timers%20are%20used%20to,output%20from%20some%20initiating%20input.&text=When%20there%20is%20an%20input%20to%20In%201%2C%20there%20is,elapsed%2Cthe%20timer%20contacts%20open. line feeding -  feeding of line changes from standby to active to different state depends on on-hook off-hook , and other line status howler tone - howler mode -   ring cadence -  polarity reversal -  Polarity of the line will be reversed,  +- of a/b wire of RJ11 polarity means  dc voltage,  it is  the directional flow of electrons from one pole to the other https://www.ixysic.com/home/pdfs.nsf/www/an-118.pdf/$file/an-118.pd...

V.92 modem --> US Robotics  V.91 modem Bell 103 --> ITU V.21 --> 300 buad rate Bell 212a --> ITU V.22 --> 1200 buad rate ITU-T Rec. V.150.1 (01/2003) Modem-over-IP networks http://what-when-how.com/voip/fax-and-modem-tones-basics-voip/ H.248 PCM AVP AMR-WB/AMR

 Flash Hook OnHook Offhook types of tones ---------------- Dial tones Ringtones Ringback tone Congestion tone MWT (Message waiting tone) Howler tone SpecialDailTone StuttleDailTone Call waiting Tone https://en.wikipedia.org/wiki/Call-progress_tone