Configuring OBi200 to work with TLS+SRTP+G711a_ONLY

[Goldenmeadow]

Hi!

I'm trying to configure my OBi200 to work with Ukrainian VoIP provider that uses TLS with SRTP and G711a only. Also provider wants me to connect to specific port (5261).
They support only PC and smartphones, but so far I managed to set up SP4 to connect to their server and authorize. I can make and receive calls...
BUT. But the call (both ways) lasts only couple minutes (3-7max) and then my OBi reboots...
I have no problem using this service on my Nexus4 with Zopier.

Does somebody experienced the same (similar) problem?

Here are settings I put:
ITSP Profile D -> SIP -> ProxyServer -> 77.109.21.44
ITSP Profile D -> SIP -> ProxyServerPort -> 5261
ITSP Profile D -> SIP -> ProxyServerTransport -> TLS
ITSP Profile D -> SIP -> RegistrarServer -> 77.109.21.44
ITSP Profile D -> SIP -> RegistrarServerPort -> 5261
ITSP Profile D -> SIP -> OutboundProxy -> 77.109.21.44
ITSP Profile D -> SIP -> OutboundProxyPort -> 5261
ITSP Profile D -> SIP -> X_OutboundProxyTransport -> TLS
ITSP Profile D -> SIP -> RegistrationPeriod -> 1800
ITSP Profile D -> SIP -> TimerT1 -> 1000
Voice Services -> SP4 Service -> X_ServProvProfile -> D
Voice Services -> SP4 Service -> AuthUserName -> xxx
Voice Services -> SP4 Service -> AuthPassword -> xxx
Voice Services -> SP4 Service -> X_SRTP -> Use SRTP When Possible

My OBi has firmware 3.0.1 (Build: 4581).

Here is the link to their setup instructions for PC:
http://www.people.net.ua:81/f/1/services/sip_telefonija/SIP1.pdf
and for smartphones:
http://www.people.net.ua:81/f/1/services/sip_telefonija/SIP.pdf

Thanks in advance!!!!