[asterisk-ss7] chan_ss7 - EWSD - Excessive errors detected in signalling unit error rate monitor

[equis software]

Hi, I'm trying to connect an asterisk with chan_ss7 to an SIEMENS EWSD
I make calls ok, but in my 10th call apprear this error...

[Aug 12 10:21:31] WARNING[22138]: mtp.c:836 mtp2_emon_count_error: Excessive
errors detected in signalling unit error rate monitor, link failed on link
'i1'.
[Aug 12 10:21:31] WARNING[22138]: chan_ss7.c:126 process_event: MTP is now
DOWN on link 'i1'.
[Aug 12 10:21:31] NOTICE[22138]: mtp.c:638 mtp_changeover: MTP changeover
last_ack=101, last_sent=101, from schannel 16, no INSERVICE schannel found
[Aug 12 10:21:31] NOTICE[22138]: mtp.c:642 mtp_changeover: Failover not
possible, no other signalling link and no other host available.
[Aug 12 10:21:31] WARNING[22138]: chan_ss7.c:126 process_event: MTP is now
DOWN on link 'i1'.
[Aug 12 10:21:32] NOTICE[22138]: mtp.c:1239 mtp2_good_frame: Sending TRA to
peer on link 'i1'....
[Aug 12 10:21:32] WARNING[22138]: chan_ss7.c:122 process_event: MTP is now
UP on link 'i1'.
[Aug 12 10:21:32] WARNING[22138]: mtp.c:1457 process_msu: Got SLTM with
unexpected sls=1, OPC=9222 DPC=4 on 'i1/16' sls=0, state=5.

My confs are...

------------------------------------------
dahdi/system.conf

loadzone        = us
defaultzone     = us

span=1,2,0,ccs,hdb3,crc4
bchan=1-15,17-31
bchan=16

--------------------------------------
/etc/asterisk/ss7.conf

[linkset-siuc]
enabled => yes
enable_st => no
use_connect => no
hunting_policy => seq_lth
context => TRONCAL-SS7-79
language => br
subservice => 8

[link-i1]
linkset => siuc
channels => 1-15,17-31
schannel => 16
firstcic => 1
enabled => yes
echocancel => allways
sltm => no


[host-eq1]
enabled => yes
opc => 4
dpc => siuc:9222 ;EWSD
links => i1:1
-----------------------------------------

Any ideas?
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