On Thu, 11 Aug 2005, Geoff Manning wrote: > We are having line noise issues in our Asterisk to legacy PBX integration. > All SIP calls originating from IP phones sound crystal clear. All calls that > originate from the legacy PBX (Isoetec 228) and route through the Asterisk > and out SIP have a lot of line noise. > > I believe I have it pinned down to these Blue Alarm errors that I can see on > the legacy PBX side. zttool shows no alarm but when I view the T1 stats on > the Isoetec I see numerous Blue Alarms.
A blue alarm sounds really strange. That indicates that the remote end (asterisk) in this case does not want to play at all. On a T1 it is sent as a continous series of unframed 1:s. I am not sure if asterisk ever sends a blue alarm (Alarm Indication Signal). Receiving a blue alarm is indicative of a serious problem. There should not be any audio at that time, since the blue alarm is actually a long unframed signal. Peter _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
