I connect with my VSP via a couple of Grandstream ATAs through the analogue trunk ports of the SL1100.
I don't have a SIP Trunk, 4 separate SIP accounts, mainly because the VSP gives good pricing on unlimited call plans with this configuration. They won't do unlimited calls through SIP Trunk configuration.
When I look to configure the SL1100 direct with the VSP, NEC manual says I need to have a trunk with a minimum of 4
I have license for feature 5001 System Port License IP Trunk quantity of 4.
It is possible to ditch the ATAs and use the SL1100 only with this VSP?