cross codec is working and same codecis not working

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Hi all,
I am using red5phone as web client and xlite as desktop client using
asterisk as sip server.
In red5phone, I enable PCMU and in xlite if I enable PCMU, voice is not
transferring. If I enable PCMA voice is transferring.

Similarly for PCMA in xlite and PCMU in red5 is working

Xlite(Codec) ---- Red5(Codec) ---- Voice transfer
PCMA              PCMA             No
PCMA              PCMU             Yes
PCMU              PCMU             One side voice transfer(xlite to red5)
PCMU              PCMA             Yes

Why cross codec is working but the same codec is not working.
Please clarify

Thanks
Hari

Original issue reported on code.google.com by harikuma...@gmail.com on 9 Jul 2009 at 7:33