OS, Kernel, Chrome version, configs

********** OS ***********
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.3 LTS
Release:        12.04
Codename:       precise

**********kernel*************
Linux version 3.8.0-29-generic (buildd@panlong) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #42~precise1-Ubuntu SMP Wed Aug 14 16:19:23 UTC 2013  x86_64 GNU/Linux

**********Chrome************
Chrome 33.0.1750.146 m

**********Asterisk************
Astersik version 11.8.0 with SRTP ( ./configure CFLAGS=-fPIC --prefix=/usr ) configured. (Same problem with asterisk 11.7.0)

***Asterisk config users.conf*** 
[4343]
canreinvite = no
type = peer
host = dynamic
context = mycontext
hassip = yes
hasiax = no
nat = force_rport,comedia
qualify = no
encryption = yes
avpf = yes
;savpf = yes
language = ru
videosupport = no
directmedia = no
disallow = all
allow = alaw
secret = mysecret
transport = ws,udp
icesupport = yes


***called extention in extensions.ael***
7 => {
     Answer();
     Playback(hello-world);
     MusicOnHold(default,300);
     Hangup();
     }
