Having trouble with SDP not being proxied through Oracle SBC.

ProductNet-Net OSProduct VersionS-Cz9.0.0Operating SystemAcme Packet OS

We recently set up an Oracle SBC in our lab and have calls going out through Twilio successfully however the RTP does not appear to be getting proxied through the SBC. Are we missing a setting that is required for this?

Ip breakdown (IPs replaced with dummy values):

8.2.100.100 NATed Public IP

10.111.70.8 LAN Side SBC IP

10.12.12.135 SIP Phone IP

INVITE sip:+18005554444@customer.pstn.twilio.com:5060 SIP/2.0
Via: SIP/2.0/UDP 8.2.100.100:5060;branch=z9hG4bK2q8mj7207goks9bi08t0.1
From: "PhonerLite" <sip:13304445555@10.12.12.135:15071>;tag=2220633695
To: <sip:+18005554444@10.111.70.8>
Call-ID: 80B93BBB-188C-EC11-8001-67B0461F6E7E@10.12.12.135
CSeq: 1 INVITE
Contact: <sip:13304445555@8.2.100.100:5060;gr=806F4BB7-F78B-EC11-BFFB-67B0461F6E7E;transport=udp>
Content-Type: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, INFO, MESSAGE, NOTIFY, OPTIONS, REFER, UPDATE, PRACK
Max-Forwards: 69
Supported: 100rel, replaces, from-change, gruu
User-Agent: PhonerLite 2.93
P-Preferred-Identity: <sip:13304445555@10.111.70.8>
Content-Length: 228

v=0
o=- 1242631729 1 IN IP4 10.12.12.135
s=PhonerLite 2.93
c=IN IP4 10.12.12.135
t=0 0
m=audio 15073 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ssrc:3539128277
a=sendrecv