Page to document Audiocodes SBC with T.38 RTP support.
Information from David Bridges <David.Bridges@audiocodes.com>:
The base software allows 3 concurrent sessions (a session being a full call)
The installation manual is: https://www.audiocodes.com/media/15926/mediant-virtual-edition-sbc-installation-manual-ver-74.pdf
Specs are light:
20GB HDD
8MB RAM
2 vCPUs - 64-bit Xeon Intel® CPU with support for hardware virtualization (Intel VT-x) enabled with Advanced Vector Extensions (AVX) and AES-NI support (Sandy-Bridge architecture or newer). Capacity figures depend on CPU speed but there isn’t a hard requirement since you are only doing testing of onesie-twosie calls
2 NICs probably makes most sense.
The user manual: User/Admin Manual: https://www.audiocodes.com/media/15567/mediant-software-sbc-users-manual-ver-74.pdf
We have an SBC Configuration Wizard which is helpful to get a base configuration. Choose generic SIP trunk and generic PBX to start (no registration on the PBX side. In reality your architecture is really SIP Trunk to SIP Trunk I imagine but we don’t have that specifically.
https://online.audiocodes.com/mediant-sbc-configuration-wizard
It's possible you will need to do transcoding and there are specific settings to allow for that.
t38OverRTP is the setting you need. Page 291 of the manual shows the info on T38 over RTP SDP example.