T.38 OXE R9.1

[link]

Hello,
I have already configured OXE Release 9.1 (I1.605.41) with other IP PBX system via SIP trunk. Other IP PBX is configured as SIP Ext. Gateway.
Voice and outbound fax are worked properly. But I have issue with incoming fax.
I got dumps and saw their. Only one setting is different in our SIP/SDP package of RE_INVITE to T.38 session.
OXE re-invite package contains "t38FaxUdpEc" (error correction) but other IP PBX reply to us with 487 SIP error message because doesn't support it and incoming fax didn't receive.

Our SDP:

v=0
o=OXE 1492063321 1492063322 IN IP4 172.17.255.10
s=abs
c=IN IP4 172.17.255.14
t=0 0
m=image 32552 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:256
a=T38FaxMaxDatagram:256
a=T38FaxUdpEC:t38UDPRedundancy

Remote SDP:

v=0
o=- 0 1 IN IP4 172.17.24.13
s=-
c=IN IP4 172.17.24.14
t=0 0
m=image 10022 udptl t38
a=T38FaxVersion:0
a=T38FaxRateManagement:transferredTCF
a=T38maxBitRate:14400
a=T38FaxMaxBuffer:1800
a=T38FaxMaxDatagram:82

Can I disable T38FaxUdpEC in OXE via Fax or System parametrs?
Thanks.

[tot3nkopf]

Maybe IP-->Fax Parameters --> FAX ECM ?

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In OXE Release 9.1 FAX ECM option doesn't present as a setting.