asterisk users - Feb 2005 - Grandstream ATA 486 works only with ulaw and alaw codecs.

Does anybody has got the some problem?

The grandstream ATA 486 schould support almost all codecs,
but it doesn't work.
I get the following message when I force the use of different codec

WARNING[9529]: chan_sip.c:2765 process_sdp: No compatible codecs!
Feb  3 11:17:15 NOTICE[9529]: chan_sip.c:7395 handle_request: Unable to  
create/find channel

What could I do to see some more detailed logs?

My sip.conf

[p1]
type=friend
username=p1
fromuser=p1
dtmfmode=rfc2833;info;inband;info;rfc2833 ;inband info                   
http://www.voip-info.org/wiki-Asterisk
secrethost=dynamic
amaflags=default                ; Choices are default, omit, billing,  
documentation
allow=all

I was trying to change almost anything.

In the granstream configuration webpage are the following
things to configure, I don't understend, maybe it could do that tric.
G723 rate: 	   6.3kbps encoding rate        5.3kbps encoding rate 	//  
tried both
iLBC frame size: 	   20ms        30ms 	// 20 ms
iLBC payload type: 	   (between 96 and 127, default is 98)	//98
Silence Suppression: 	   No        Yes 	
Voice Frames per TX: 2	   (up to 10/20/32/64 for G711/G726/G723/other  
codecs respectively) 	// did not try
Layer 3 QoS: 	   (Diff-Serv or Precedence value)	  // 48
Layer 2 QoS: 	  802.1Q/VLAN Tag      802.1p priority value  (0-7)  /0 0

I'm using the 1.0.5.16 firmaware, and was using the buggy 1.0.5.21

My asterisk is working fine with about 8 SIP and IAX2 providers using any  
codecs ...
(also the 723) I'm using about 1 month old Asterisk from the CVS.

Any comments would be appreciated.