c20f34992a
Q.921 was passing a q931_dl_indication(up) event to Q.931 before it was finished processing the frame. The q931_dl_indication(up) event could immediately send STATUS messages in the Q.921 intermediate state that would then get stuck in the tx queue with an invalid N(S). Q.921 was passing i-frames to Q.931 before it was finished processing the frame. The i-frames could cause Q.931 to immediately generate a response message that may cause the peer to see the P/F bit as incorrect. Delayed passing q931_dl_indication(up) events and i-frames to Q.931 until Q.921 has completed processing the frame event. (The Q.921 SDL diagrams were designed with this assumption.) (closes issue #17360) Reported by: shawkris Patches: issue17360_v1.4.patch uploaded by rmudgett (license 664) Tested by: shawkris, rmudgett git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@1962 2fbb986a-6c06-0410-b554-c9c1f0a7f128
libpri: An implementation of Primary Rate ISDN Written by Mark Spencer <markster@digium.com> What is libpri? =============== libpri is a C implementation of the Primary Rate ISDN specification. It was based on the Bellcore specification SR-NWT-002343 for National ISDN. As of May 12, 2001, it has been tested work with NI-2, Nortel DMS-100, and Lucent 5E Custom protocols on switches from Nortel and Lucent. What is the license for libpri? =============================== libpri is distributed under the terms of the GNU General Public License, which permit its use and linking with other GPL'd software only. The GNU GPL is included in the file LICENSE in this directory. As a special exception, libpri may also be linked to the OpenH323 library, so long as the entirity of the derivative work (as defined within the GPL) is licensed either under the MPL of the OpenH323 license or the GPL of libpri. If you wish to use libpri in an application for which the GPL is not appropriate (e.g. a proprietary embedded system), licenses for libpri under more flexible terms can be readily obtained through Digium, Inc. at reasonable cost. How do I report bugs or contribute? =================================== For now, contact the author directly. In the future if there is sufficient interest, we will setup a mailing list. Does anything use this library so far? ====================================== Yes, the Asterisk Open Source PBX does. http://www.asterisk.org Also, the Zapata library has hooks for it. http://www.zapatatelephony.org Special thanks ============== Special thanks to Jim Dixon <jim@lambdatel.com> for his help in testing and fixing the implementation.