We are working a government project and they don't allow SIP trunks yet and hand-off POTS lines only so we got a GrandStream HT881 but I can't get incoming or outgoing calls to work. I can get it to register with 3CX but that's it. The manual is basally useless and I can't find any example configs that work. I've done a packet capture, but the GrandStream isn't sending the incoming call to 3CX; it's just taking the call from FXO1 and sending it to FXS1 even thought that profile is disabled. I have a ticket open w/ GrandStream but very poor communication. Struggling a bit here and need help. Thanks in advance.
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