I wanted to follow up and share that this worked well for my needs and was very easy to setup. Since this is just an SMPP gateway simulator, it is not really possible to have an SMS conversation between two endpoints without additional setup and software. But this makes sense. Genesys SMS server would be considered an ESME client and would deliver messages to its clients (agents on an agent desktop). Simulator provides several ways to inject mobile originated (MO) messages destined for the ESME (in my case Genesys SMS server). However if agent responds to a message, the message gets held in an internal SMPP simulator queue since there is not a second/destination ESME for the message to be delivered to. A person would need to connect/wire up a second/additional ESME client for response messages to be sent to. Or in poor mans land, a second instance of Genesys SMS server would work fine so long as the MSISDNs (x-smpp-address-range setting on SMS server) is setup and registers with the simulator properly. At this point two instances of WDE could be used to simulate two cell phones and send either page mode messages back and forth or engage a session mode. All of this discussed here still adheres to SMPP v3.4 spec, even the hacky setup of two Genesys SMS servers / WDE to simulate cell phones.
