> Rich Adamson - would appreciate your advice as well, as your mail is the > closest I have seen to a knowledgeable response so far in regards to > this crackling issue. I have a customer who has a very similar > crackling problem and to date we have suspected it to be the ISDN BRI > adapter and/or CAPI, as it affects calls in progress over the genuine > TDM400P card (which has 4 FXS ports) and SIP simultaneously. > > Although the nature of this problem seems to vary, the customer reports > that the crackling usually starts when an external call is received at > which time the crackling overwhelms all voice channels and everyone has > to hang up and re-establish the calls (after which everything works fine > again).
So far, the three people that have complained about crackling noise are all running the Stable version of asterisk. I have only used cvs-head, and I'd be real curious if there isn't something wrong with Stable. > Could it be possible that a problem with the TDM400P could affect SIP > calls on Asterisk as well? I would doubt that simply because there are a lot of TDM cards in use and only a small number that are complaining about the crackling noise. I've not had that problem with either the original TDM or with the most current TDM version. > I don't think I have an interrupt problem (see interrupt table pasted > below) and the output of zttest appears to be ok (at least as good as > 99.96% accuracy), so we are stumped. Linux, Asterisk and ISDN driver > versions as follows. Appreciate any help you can offer. My best guess (in order of what I'm guessing the problem to be): - Stable version might have a problem - Interrupts (eg, disk activity impacting TDM interrupts) - half vs full duplex ethernet connection (look at output from "dmesg") - old TDM card version (ver E/F, look at output from "dmesg") FWIW, the digium TDM card has a two year warrantee and it was first released about a year ago. Therefore every TDM card is still under warrantee. If you have a ver E/F card, I'd strongly suggest calling digium support to have it replaced, regardless of where you are located. Our old TDM rev E/F would completely fail about every week or two, and the only way to restore operation is to stop asterisk, stop the drivers, and restart both. On _some_ occations, the card would fail in such a way as to create nothing but noise, but that was not very often for our system. _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
