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January 2021

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2 discussions

[Freeswitch-dev] DTMF dropped due to remote party re-starting packet numbers from 0 for each digit
by Andy Newlands 19 Jan '21

19 Jan '21

Hi, A 3rd-party is sending each RFC2833 DTMF digit with a new SSRC and starts the packet sequence numbering at ZERO for each new digit. I can see, in switch_rtp.c: handle_rfc2833(), that FS makes a note (in the session) of the last DTMF packet it processed, then drops any subsequent packets with a sequence number less than that. My questions are: 1. Is the remote-party compliant with relevant RFCs when they set a new SSRC for each DTMF digit? 2. Is the remote party compliant with relevant RFCs when they re-start packet sequence numbers from 0 for each DTMF digit? 3. Looking at the source for handle_rfc2833(), I can't see any setting which could be used to force FS to 'tolerate' the above behaviour 4. If I alter handle_rfc2833(), to cope with that behaviour, am I likely to run into problems with other remote systems (E.G. possibly ending up with duplicate digits) Thanks, Andy

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[Freeswitch-dev] xmlrpc websocket bug and fix
by Royce Mitchell III 14 Jan '21

14 Jan '21

I have found and fixed a bug in mod_xml_rpc's websocket code. I know my fix is not comprehensive, but it does prevent the 100% reproducible catastrophic behavior in FreeSWITCH that I'm experiencing specifically. Would one of the developers be willing to review my findings and convert them into a more proper fix please? https://github.com/signalwire/freeswitch/issues/1031 Thanks! Royce Mitchell, IT Consultant ITAS Solutions royce3(a)itas-solutions.com There are three hard problems in computer science: naming things, and off-by-one errors.

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