Looking for recommendations, warnings, caveats, tips & tricks, configuration advice for an alternative SBC to Avaya's ASBCE. Primary reason is that our customers cannot afford ASBCE. Please let me know any alternatives that have worked successfully along with any caveats, tips & tricks, etc... There are 25 J189 users on-site; 10 J189 users off-site; and 25 users off-site using Avaya Workplace on iOS and Mac (usually logged into both). Plus 25 SIP trunks. Thank you.