Hello,
I installed Asterisk 1.6.2.17.3 ( latest as of yesterday ) and had multiple
problems with DTMF.
I have two machines, we'll call them asterisk and asterisk-pri. Asterisk does
IVR and asterisk-pri has a PRI card in it and connects to the PSTN. The two
servers communicate via SIP with RFC2833.
I setup logger.conf on both machines to display DTMF to the console. Both are
built from source.
Asterisk : spandsp, dahdi, asterisk.
Asterisk-pri : spandsp, libpri, dahdi, asterisk wanpipe
I eliminated AGI, hard phones, network et al by setting up this extension :
exten => 22,1,Dial(SIP/114186939...@pri1.omnity.net,30,D(132412983#))
in default.
The only other non default setting is in sip.conf I added a outboundproxy (
which does NOT do RTP, only SIP ).
I called asterisk from my hard phone ( gxp2000 ) by dialing 22.
I see the console DTMF messages indicating the DTMF was sent or received. ( I
forgot to keep this output ).
I than watch the console DTMF output on asterisk-pri and it showed about half
the DTMFs. The pager that was called showed the DTMFs that appeared on the
asterisk-pri console.
So somewhere between the two machines, the DTMFs have disappeared. So I ran
TCPDump on asterisk and saw that close to half of the DTMF events were never
sent.
tcpdump -i eth0 -n -s 0 dst asterisk-pri-ip -vvv -w ~/dtmf.pcap
I imported the file into wireshark on my local machine and confirmed that the
dump almost matches what I saw on asterisk-pri.
So, problem 1 : Asterisk is not sending all the DTMFs to asterisk-pri.
I compared the packet scan to what I saw on asterisk-pri and noticed that
between 1 and 3 dtmfs were missing.
Problem 2 : Asterisk-pri loses some received DTMFs.
I also noticed that some of the DTMFs coming out of asterisk had the wrong
Event Duration. I had one DTMF with a duration of about 58000 ( I believe
that's 58 seconds ) but I only pressed the button for like 1/3 of a second.
What I do not understand is that I in my final test last night was using
asterisk 1.6 current with centos ( os that asterisk is developed on from my
understanding ) with all default settings ( excluding logger.conf, dialplan and
outboundproxy ) and I am having problems with the DTMF.
Both servers were installed with CentOS 5.5 and were updated last night, after
which I reinstalled asterisk. This did not resolve the issue.
I am at wit's end and do not know where to go from here. I would really
appreciate it if someone could give me some pointers on where to go next, what
additionnal debugging steps I should perform. I would also really appreciate if
someone could propose a solution.
Please help!
David
Never give up, never surrender
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