How to handle inbound SMS in a multiple SMPP server environment?

If you are using multiple SMPP hosts you can configure your Nexmo binds so that you only receive inbound SMS (MO) to a specific host. You would need to specify a unique system-type 'per host' in the receiver or transceiver bind request when establishing an SMPP connection to the Nexmo SMPP server. You would then specify the desired system-type for your virtual numbers under Numbers in your Nexmo dashboard. Subsequently, the inbound message would be delivered to any receiver or transceiver bind that specified the same system-type parameter.

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