Asterisk no plays audio files

I have configured asterisk but i can’t hearing sounds files.
Calls incoming well. I put a simple cmd Answer and a Playback in my dialplan. Asterisk say playing…but i do not hear nothing!!
The sounds dir appears to be correc. /var/lib/asterisk/sounds/es
I’m connected with s7. Link and channels ok.

*CLI> ss7 link status
linkset:siuc, link:i1/16, state:INSERVICE, sls:0, total: 655983520/655983552

*CLI> ss7 show channels
Linkset: siuc
CIC 1 Idle

CIC 31 Idle

telpin@marianoacosta:/var/log$ sudo dahdi_cfg -vvvvvvvvvvvvv
DAHDI Tools Version - 2.10.1

DAHDI Version: 2.10.1
Echo Canceller(s): MG2

SPAN 1: CCS/HDB3 Build-out: 0 db (CSU)/0-133 feet (DSX-1)
SPAN 2: CCS/HDB3 Build-out: 0 db (CSU)/0-133 feet (DSX-1)

Channel map:

Channel 01: Clear channel (Default) (Echo Canceler: mg2) (Slaves: 01)

Channel 31: Clear channel (Default) (Echo Canceler: mg2) (Slaves: 31)

telpin@marianoacosta:/var/log$ sudo dahdi_hardware -vvvvvvvvvvv
pci:0000:02:00.0 wcte43x+ d161:800e Wildcard TE435/235

Ubuntu server Ubuntu 15.04
Asterisk 11.17.1

– Recv IAM CIC=6 ANI=2254492192 DNI=2254519000 RNI= redirect=no/0 complete=1
– Executing [2254519000@TRONCAL-SS7-77:1] Set(“SS7/siuc/6”, “IDRUTA=73”) in new stack
– Executing [2254519000@TRONCAL-SS7-77:2] Set(“SS7/siuc/6”, “IDTRONCAL=77”) in new stack
– Executing [2254519000@TRONCAL-SS7-77:3] Answer(“SS7/siuc/6”, “500”) in new stack
– Executing [2254519000@TRONCAL-SS7-77:4] Playback(“SS7/siuc/6”, “/var/lib/asterisk/sounds/es/registrar”) in new stack
– <SS7/siuc/6> Playing ‘/var/lib/asterisk/sounds/es/registrar.alaw’ (language ‘es’)

telpin@marianoacosta:/var/lib/asterisk/sounds/es$ ls -lst registrar.*
4 -rwxr-xr-x 1 asterisk asterisk 970 Feb 16 2010 registrar.g729
8 -rwxr-xr-x 1 asterisk asterisk 7776 Feb 16 2010 registrar.ulaw
4 -rwxr-xr-x 1 asterisk asterisk 1617 Feb 16 2010 registrar.gsm
8 -rwxr-xr-x 1 asterisk asterisk 7776 Feb 16 2010 registrar.alaw

What is wrong? Codecs?? I read the codecs for sip.conf or iax.conf but isn’t for me. I think.
Thanks a lot for your help.