Call Conference
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
Posts
SIP when interacting with Network , issue is on network
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
Terminology
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...
Types of modems and codecs
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
Types of hooks & ringtones
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
DigitMap
https://sipfoundry.atlassian.net/wiki/spaces/sipXecs/pages/491748/Digit+Maps+used+to+Define+the+Dial+Plan https://www.symetrix.co/wp-content/uploads/2016/04/2014-07-VoIP-Digit-Map.pdf https://www.poly.com/ca/fr/support/knowledge-base/kb-article-page?lang=en_US&urlName=knova-33287-how-to-configure-understand-digit-map-on-polycom-phones https://support.polycom.com/content/dam/polycom-support/products/voice/soundstructure/other-documents/en/understanding-digit-maps-tech-tip.pdf https://knowledgebase-iframe.polycom.com/kb/viewContent.do;jsessionid=EBE29064D5174273CE8E30453DAB9FF4?externalId=38743 https://documents.polycom.com/bundle/obi-ag-640/page/OBiPhoneAdminGuide/call_controls/TOC_Digit_Map_Configuration.htm T Wait for timeout when dialing "R" Digit map extension letter R indicates that certain matched strings are replaced. For example, R555R604R would replace 555 with 604. "E" Specify ending termination digit which follows (usually * or #) The letter "P...