One way audio e1

I am having issue with on eway audio communicoation. the issue is random, but occurs on a daily base.
While on conversation the caller is not capable to listen to the third party anymore.It is like a mute is applied on the channel of the “called” party and the caller hangup

  • Configuration: CentOS 6.5 x86_64, Asterisk 11.6 cert6, Dahdi 2.9.2, Libpri 1.4.15, Sangoma driver 7.0.10

  • Connectivity: PSTN – Asterisk – Alcatel – Alcatel digital phone or PSTN – Asterisk – SIP Phone

  • No overruns on the E1 (to PSTN and to Alcatel)

  • With CentOS 5.5 x86_64, Asterisk 1.2.40, Zaptel 1.2.27, Libpri 1.2.4, Sangoma driver 3.4.9, no issue with the same type of connectivity
    Do you have some idea/suggestion or do someone experience the same issue?

Contact Sangoma.