On Thursday 09 April 2009 04:28:16 Olivier wrote: > 2009/4/8 Tilghman Lesher <[email protected]> > > > On Tuesday 07 April 2009 23:38:08 Olivier wrote: > > > 2009/4/7 Mark Michelson <[email protected]> > > > > > > > Philipp Kempgen wrote: > > > > > BTW (developer's question) is there a reason why SendText() resp. > > > > > sendtext_exec() refuses to send zero-length data? > > > > > > > > I can't point to any specific reason. I assume that whoever wrote the > > > > application probably thought that attempting to send zero-length data > > > > was > > > > > > pointless and that if no data were passed to the application, it > > > > likely was due > > > > to an error by the user. > > > > > > The phone I'm working on (Thomson ST2030) would display in slow > > > blinking, inversed letters (white on black) any text received in SIP > > > MESSAGE. Display duration is unlimited. > > > To erase an old message, you must send a single carriage return (or > > > maybe an empty string). > > > > > > I'm wondering how many phones behave like this ? > > > > > > Maybe, sendtext should then be refactored to accommodate this. > > > > What does the phone do when you send a single space? > > It would display it as a black rectangle : as unfortunately, this phone > displays text in inversed color (white letters on black background), a > single space remains visible. > > It seems I really need to send a carriage return ($0D in hexa) but I > couldn't find a way to pass such string using SendText. > > As suggested earlier, maybe an empty SIP MESSAGE would do the trick but as > SendText rejects empty strings, I've not tested it yet. For that, maybe I > could try to build my own custom SIP MESSAGE, faking a true SIP MESSAGE to > double check if an empty string would be acceptable solution ? > > (Note, that sending a carriage return must work as vendor handed to me a > Wireshark capture for a "working SIP MESSAGE")
I suspect not. You really need to send an empty message; that is, a message with a content-length of 0. A message containing a carriage return would still have a content-length of 1 and would confuse the phone at worst, and display an unprintable character, at best. You could send an empty message in SendText with SendText(,), but chan_sip still doesn't allow the empty message, so a code change is still necessary. -- Tilghman _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
