what PCM codec? ulaw or alaw?

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Asterisk Users 3 Comments

Hi everybody,
got it from svn:

dtmf_2833_1.pcap

*/asterisk/trunk/tests/rfc2833_dtmf_detect/configs/extensions.conf PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/configs/sip.conf PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/run-test PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/broken_dtmf.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/broken_dtmf.xml
PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_1.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_1_noend.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_2.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_2_noend.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_3.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_3_noend.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_4.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_4_noend.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_5.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_6.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_7.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_8.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_9.pcap UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_pound.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_2833_star.pcap
UNKNOWN
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_baseline.xml
PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/dtmf_noend.xml
PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/sipp/register.xml PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/test-config.yaml PRE-CREATION
*>* /asterisk/trunk/tests/rfc2833_dtmf_detect/test.lua PRE-CREATION
*

wonder what’s the PCM coding format within these captures? ulaw or alaw?
I’m looking for alaw captures.

3 thoughts on - what PCM codec? ulaw or alaw?

  • Since they are packet captures of RTP frames, the RTP payload numbers in
    the frames will indicate what format they contain. Have you opened the
    files with Wireshark or any other tool that can interpret PCAP files?

  • thanks. opened with wireshark and it’s clearly show the format, digits.

    another question: each pcap has multiple frames, each frame has digit,
    volume 10, and duration. why it has more than one frame? would not it send
    multiple digit each pcap?