*CLI>   == BRI1: Incoming call '0641216636' -> '703241494'
[New Thread 813753584 (LWP 28681)]
    -- Executing Macro("CAPI/BRI1/703241494-0", "stdexten|1003|
SIP/1003") in new stack
    -- Executing Dial("CAPI/BRI1/703241494-0", "SIP/1003|10|TtwW") in
new stack
Dec  5 20:46:05 WARNING[28681]: channel.c:2494 ast_request: No
translator path exists for channel type SIP (native 65535) to 0
Dec  5 20:46:05 NOTICE[28681]: app_dial.c:1011 dial_exec_full: Unable to
create channel of type 'SIP' (cause 0 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing Goto("CAPI/BRI1/703241494-0", "s-CHANUNAVAIL|1") in new
stack
    -- Goto (macro-stdexten,s-CHANUNAVAIL,1)
    -- Executing Goto("CAPI/BRI1/703241494-0", "s-NOANSWER|1") in new
stack
    -- Goto (macro-stdexten,s-NOANSWER,1)
    -- Executing Answer("CAPI/BRI1/703241494-0", "") in new stack
  == BRI1: Answering for 703241494
    -- Executing Wait("CAPI/BRI1/703241494-0", "1") in new stack
[New Thread 814015728 (LWP 28682)]
[Thread 814015728 (LWP 28682) exited]
Dec  5 20:46:06 NOTICE[28681]: channel.c:1893 ast_read: Dropping
incompatible voice frame on CAPI/BRI1/703241494-0 of format alaw since
our native format has changed to unknown
[New Thread 814015728 (LWP 28683)]
Dec  5 20:46:06 NOTICE[28681]: channel.c:1893 ast_read: Dropping
incompatible voice frame on CAPI/BRI1/703241494-0 of format alaw since
our native format has changed to unknown
Dec  5 20:46:06 NOTICE[28681]: channel.c:1893 ast_read: Dropping
incompatible voice frame on CAPI/BRI1/703241494-0 of format alaw since
our native format has changed to unknown

[snip about 100 of these lines]

Dec  5 20:46:07 NOTICE[28681]: channel.c:1893 ast_read: Dropping
incompatible voice frame on CAPI/BRI1/703241494-0 of format alaw since
our native format has changed to unknown
    -- Executing VoiceMail("CAPI/BRI1/703241494-0", "u1003") in new
stack
Dec  5 20:46:07 WARNING[28681]: channel.c:2313 set_format: Unable to
find a codec translation path from unknown to gsm
Dec  5 20:46:07 WARNING[28681]: file.c:820 ast_streamfile: Unable to
open vm-theperson (format unknown): No such file or directory
  == BRI1: CAPI Hangingup
[New Thread 814015728 (LWP 28684)]
       > CAPI INFO 0x3490: Normal call clearing
[Thread 813753584 (zombie) exited]
[New Thread 814277872 (LWP 28685)]
[Thread 814015728 (LWP 28684) exited]
[Thread 814277872 (LWP 28685) exited]

Strange since there is no issue with this setup on a i686. On the
Asterisk console "show translation" gives:
*CLI> show translation
         Translation times between formats (in milliseconds)
          Source Format (Rows) Destination Format(Columns)