Hello Sir.
I am system and voice network engineer. I have been working with SBC 10 years. I use both PRI gateway and SBC. I am expert at Telcobridges FreeSBC and Audiocodes SBC Mediant series. I am expert also Dialogic and Telcobridges media gateway with PRI. I set SIP trunk with SBC and Genesys, Avaya, Vocalcom, Asterisk, FreePBX. I can help you set and upgrade SBC and also PRI gateway. I can help you for set trunk immediately. Thank you