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I use Wireshark to capture a call between two clients using telephony software. The codec used is G711 PCMU and comfort noise (PT=CN), as you can see in picture 1 there are 7 streams altogether, as you can see in picture 2. I want to save the payload as .au file, however, I can only save the first 5 streams (which only contain some ringing sound or background noise) as .au files, the last 2 (which contain the speech content) can't be saved as .au file (but they can be saved as .raw format). The error message is “Can't save in a file: saving in au format supported only for alaw/ulaw streams”

However, I can play them using Telephony->VoIP Calls->Player

What is wrong with this? Thank you!

pic1 pic2

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asked 17 Nov '10, 09:36

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esolve
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edited 18 Nov '10, 03:44

These pictures can't be viewed; "You don't have permission to access the requested object."

(18 Nov '10, 01:15) Jaap ♦

No answer yet, but maybe people can interpret the pics:

Links to the pics for those who don't like page source ;)

http://img3.laibafile.cn/getimgXXX/2/4/photo2/2010/11/18/middle/65401101_3131263_middle.jpg http://img3.laibafile.cn/getimgXXX/2/1/photo2/2010/11/18/middle/65401102_3131263_middle.jpg

If you get an error message stating Access Denied, click the Link inside the error statement to the file again. Worked fine for me using IE8

(18 Nov '10, 05:20) Landi

As the error says: "saving in au format supported only for alaw/ulaw streams". If there's PT_CN packets in the stream it cannot properly save these in au format, because there's no conversion for this payload type provided.

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answered 18 Nov '10, 06:59

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Jaap ♦
11.7k16101
accept rate: 14%

But I can play them using the functionality within Wireshark. And previously, I have also captured some packets where there seems to be CN payload and I CAN also save them as .au file.

(19 Nov '10, 05:34) esolve

However, I can play them using Telephony->VoIP Calls->Player SO I think wireshark can convert them?

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answered 21 Nov '10, 16:58

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esolve
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question asked: 17 Nov '10, 09:36

question was seen: 6,996 times

last updated: 21 Nov '10, 16:58

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