asterisk users - Jul 2009 - Asked to transmit frame type 256, while native formats is 0x4

Hi, sorry to bother u all, i have a trouble

when I call a did number forward to my asterisk server, the server told me:

[Jul 28 19:00:57] WARNING[28080]: chan_sip.c:3806 sip_write: Asked to
transmit frame type 256, while native formats is 0x4 (ulaw)(4) read/write 0x4
(ulaw)(4)/0x4 (ulaw)(4)
[Jul 28 19:00:57] WARNING[28080]: chan_sip.c:3806 sip_write: Asked to
transmit frame type 4, while native formats is 0x100 (g729)(256) read/write
= 0x4 (ulaw)(4)/0x4 (ulaw)(4)

and I have setup allow=ulaw, alaw, g729 in the sip.conf file

could someone tell me what should I do?

Thanks,

Jacob
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