Record stream with H.264 and PCMU: is it supported?

I tried to record a stream which is published with H.264 codec and the telephony (PCMU) codec with a Flash Player 11+ client. The stream plays fine live but when I try to record it, I get the following error on the status of the stream: NetStream.Record.NoAccess. The file is created on disk but has only 21 KB, never more, never less. This is my log:
10:21:49.550 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Data.Start (level: undefined, length: 0 sec.)
10:21:49.554 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Publish.Start (level: status, length: 0 sec.)
10:21:49.556 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Play.Reset (level: status, length: 0 sec.)
10:21:50.107 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Record.Start (level: status, length: 0 sec.)
10:21:59.962 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Record.NoAccess (level: status, length: 0 sec.)
10:21:59.966 info   Stream (record_Aaj3g/u28_T32l87h.f4v) status: NetStream.Record.Stop (level: status, length: 0 sec.)
I digged the problem a little and found that I also have an error in the Windows Event Viewer from AMSCore:
Error from libmp4.dll:
Received an audio packet of unknown type..
I even tried to publish the stream in "record" mode instead of "live" directly from the client to see if it does the same thing. It does, I get exactly the same result.
I searched on the web hoping to find something about the problem but without any result. The only reference I see is a table in the AMS documentation listing the supported file types and codecs but there is no mention of the PCMU/PCMA codecs. Here: http://help.adobe.com/en_US/adobemediaserver/techoverview/WS07865d390fac8e1f-4c43d6e71321e c235dd-7fff.2.3.html#WS5b3ccc516d4fbf351e63e3d119ed944a1a-7fe7.2.3
In last resort, I tried to publish the file as RAW. It seems to work but I can hardly use this format since it is only usable by Flash Player I think. I cannot convert or reuse the file on another platform.
By the way, I had the same result on FMS 3.5.3 and AMS 5.0.1
Any idea? Is this normal or what?

Update: I discovered several other recordings which had 21 kb in size, also f4v but with only sound, nellymoser. I did not get any error in logs or event viewer which makes it tough to debug! What could cause such a thing? I understand that there is no data recorded in the stream file, except metadata probably. I tried to convert such a file with ffmpeg and got an error saying there is no stream data found in file.
The method we use for publishing/recording is the following: the stream is published from the client in live mode (no record at all). On the server side, I create a new Stream and attach the publishing stream to it. Then I record the new stream. It seems to be working great in most cases but sometimes, for unknown reasons, it does not work.
Anybody, an idea?

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