Ray Jackson schrieb: > Luki wrote: > >>>However, when I execute >>>TxFax I see two g711 alaw packets going out for every one coming back, so my >>>outbound throughput is around 160kbps now. The second packet's payload >>>looks similar to the first, almost like a duplicate. >>> >>> >> >>I'm no expert, but I think that's the redundancy intrinsic to T.38. >>Steve Underwood had a page on T.38 but it's gone... Google's cache: >>http://72.14.253.104/search?q=cache:6vjemQ-5rCsJ:www.soft-switch.org/t38/ch02.html >> >> > I am far from an expert myself, but from my understanding the fax > conversation starts out as standard RTP voice traffic (G711) and then > switches to T.38 when the receiving gateway (usually) detects a fax tone > - at least, this is the way the Cisco 5400's seem to operate. However, > my issue is that I am never actually switching over to T.38/UDPTL > transmission as the fax tone itself is not recognised and is coming > through as garbage to the other fax machine. I was wondering if it was > possibly related to the 2 x alaw packets being sent where I would > usually expect to see just 1? If there is some redundancy also built > into the initial RTP G711 conversation, I'm wondering if this can be > disabled somehow in the SpanDSP or OPBX code/config? >
I 've met the same issue (see also Bug #279). Best regards Hans _______________________________________________ Openpbx-users mailing list [email protected] http://lists.openpbx.org/mailman/listinfo/openpbx-users
