[asterisk-ss7] ss7 link not_aligned

[caio]

Hi,

I'm trying to link an asterisk (v1.4.21, w/dahdi, w/chan_ss7-1.1 on gentoo os) with an EWSD switch but the link is not aligned.

here the console messages (and below my config):

 Loaded chan_ss7.so => (SS7 Protocol Support)
# ss7 link status
linkset mylinkset, link l1, schannel 16, sls 0, NOT_ALIGNED, rx: 45, tx: 2/4, sentseq/lastack: 127/127, total    114672,    114768

# ss7 link status
linkset mylinkset, link l1, schannel 16, sls 0, NOT_ALIGNED, rx: 22, tx: 0/4, sentseq/lastack: 127/127, total    172032,    172128

[Jul 13 12:38:19] WARNING[6890]: mtp.c:483 t2_timeout: MTP2 timer T2 timeout (failed to receive 'O', 'N', or 'E' after sending 'O'), initial alignment failed on link 'l1'.
[Jul 13 12:39:35] WARNING[6890]: mtp.c:483 t2_timeout: MTP2 timer T2 timeout (failed to receive 'O', 'N', or 'E' after sending 'O'), initial alignment failed on link 'l1'.


the config:
-----------

# cat /etc/dahdi/system.conf
# Global data
loadzone        = us
defaultzone     = us
span = 2,1,0,ccs,hdb3
bchan = 1-31
alaw = 1-15,17-31

# cat /etc/asterisk/ss7.conf 
[linkset-mylinkset]
enabled => yes
use_connect => yes
enable_st => yes
hunting_policy => odd_lru
t35 => 15000,timeout
subservice => national
variant => ITU
context => ss7
language => es

[link-l1]
linkset => mylinkset
channels => 1-15,17-31
schannel => 16
firstcic => 1
enabled => yes
echocancel => no
echocan_train => 350
echocan_taps => 128

[host-sifon]
enabled => yes
opc => 1234
dpc => mylinkset:4321
links => l1:1
ssn => 7

[jitter]


Any comment is welcome.
Regards,

Caio