Hi
today we have 20 users using CISCO SPA502G and SPA504G phones, connected to a Linux (Asterisk) and working with SPA400 gateway to communicate with 4 analog lines from our local PSTN.
We are planning to move from analog lines to E1, what is the best equipment to replace current linux iPBX, since we need provide MAILBOX for each Externsion/User, provide external extension (connected to Softphones on Laptop and also for SmartPhones Android and iPhone)?
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One person more experienced with Cisco or IP telephony, can share some advices about what device (iPBX + Gateway) should we buy?