Hi all,
I've been using the Digium TC400 G729/G711 transcoder card in various
Asterisk installations for a while with great results, but I'd like to
start using it on an embedded platform, such as the Soekris net5501.
I grabbed AstLinux 0.6.5, and with some symlinking (/dev/zaptranscode =>
/dev/zap/transcode) and firmware copying
(/lib/firmware/zaptel-fw-tc400m.bin), got the 'wctc4xxp' transcoder
module loaded with Asterisk recognizing it. During a call however, the
transcoding thread doesn't seem to be able to read from the device, and
subsequently no audio is passed between the endpoints. I've tried with
two known working cards, one of which is back in production. An strace
is included the end of the message.
I'm pretty sure this isn't strictly a problem with AstLinux, because
I've installed Asterisk 1.4.24.1 with Zaptel 1.4.12.1 on a new machine a
stock Linux install and had exactly the same results. Normally I'd just
change versions and be done with it, but I'd like to start using
AstLinux for this project, and it doesn't look like upgrading versions
is a trivial task. :)
I've already put in a ticket with Digium support, but I'm emailing the
board because I'm hoping someone else here might have run into a similar
problem and might know a workaround. Unfortunately I haven't found any
forum postings or bug reports to date about it.
Here's a snippet of an strace between a call from a phone in G729
(172.20.33.73) and another Asterisk box in G711 (172.20.32.10).
--------
recvfrom(33,
"\200\0Vu\353\246\250F*\202rC}}~~\377\376\376\376\376}~"..., 8192, 0,
{sa_family=AF_INET, sin_port=htons(25862),
sin_addr=inet_addr("172.20.32.10")}, [16]) = 172
gettimeofday({1243434707, 29870}, NULL) = 0
time(NULL) = 1243434707
write(37,
"\370\377\360\377\360\377\360\377\370\377\10\0\370\377\370"..., 160) = 160
poll([{fd=37, events=POLLOUT, revents=POLLOUT}], 1, 50) = 1
read(37, 0x81e31a0, 8000) = -1 EAGAIN (Resource
temporarily unavailable)
poll([{fd=29, events=POLLIN|POLLPRI, revents=POLLIN}, {fd=30,
events=POLLIN|POLLPRI}, {fd=31, events=POLLIN|POLLPRI}, {fd=33,
events=POLLIN|POLLPRI}, {fd=34, events=POLLIN|POLLPRI}, {fd=35,
events=POLLIN|POLLPRI}], 6, -1) = 1
fcntl64(31, F_GETFL) = 0x800 (flags O_RDONLY|O_NONBLOCK)
read(31, 0xbb7fa53c, 4) = -1 EAGAIN (Resource
temporarily unavailable)
recvfrom(29,
"\200\22\355\310\n3\326\273H\256A\233x\6\36\353\300\272"..., 8192, 0,
{sa_family=AF_INET, sin_port=htons(2222),
sin_addr=inet_addr("172.20.33.73")}, [16]) = 32
gettimeofday({1243434707, 47654}, NULL) = 0
time(NULL) = 1243434707
write(38, "x\6\36\353\300\272\316\314\rV\370~\271\270\250\232\326"...,
20) = 20
poll([{fd=38, events=POLLOUT, revents=POLLOUT}], 1, 50) = 1
read(38, 0x81e5276, 1024) = -1 EAGAIN (Resource
temporarily unavailable)
poll([{fd=33, events=POLLIN|POLLPRI, revents=POLLIN}, {fd=34,
events=POLLIN|POLLPRI}, {fd=35, events=POLLIN|POLLPRI}, {fd=29,
events=POLLIN|POLLPRI}, {fd=30, events=POLLIN|POLLPRI}, {fd=31,
events=POLLIN|POLLPRI}], 6, -1) = 1
fcntl64(35, F_GETFL) = 0x800 (flags O_RDONLY|O_NONBLOCK)
read(35, 0xbb7fa53c, 4) = -1 EAGAIN (Resource
temporarily unavailable)
--------
Thanks,
Josh
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