tyntec’s One Time Password (OTP) SMS based on SMPP is a service which enables you to send SMS for Two-Factor-Authentication (2FA) purposes to all operators listed on tyntec’s coverage list using the SMPP protocol. tyntec supports SMPP protocol version 3.4.
Authentication is done during the setup of the SMPP connection. After the initial authentication, the session between your system and ours (i.e. the peers) is kept open and alive.
The following figure illustrates the workflow for sending OTP SMS:
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SMPP session types |
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Transmitter session |
Used for you to send SMPP requests to tyntec |
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Receiver session |
Used by tyntec to send SMPP requests to you |
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Transceiver session |
Used in both the ways above |
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Supported SMPP operations |
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SMPP operation |
Who is initiating it |
Role |
Answered by the other party with |
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bind_transmitter |
You |
Establish a transmitter session. |
bind_transmitter_resp |
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bind_receiver |
You |
Establish a receiver session. |
bind_receiver_resp |
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bind_transceiver |
You |
Establish a tranceiver session. |
bind_transceiver_resp |
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unbind |
You |
Close a session. |
unbind_resp |
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generic_nack |
tyntec |
Negative answer to a faulty request or if the service is currently unavailable. |
N/A |
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submit_sm |
You |
Send an SMS. Works with transmitter and transceiver sessions. |
submit_sm_resp (contains a unique message ID) |
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deliver_sm |
tyntec |
Provider a delivery receipt (DLR). Works with receiver and transceiver sessions. |
deliver_sm_resp (if the customer doesn’t answer with this, tyntec will retry the deliver_sm) |
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enquire_link |
You and/or tyntec |
Check if a session is still working. |
tyntec sends an enquire_link through an open session every 90 minutes. You should answer this with an “enquire_link_resp”. If this doesn’t happen for 5 times in a row, tyntec will terminate the respective session. tyntec answers with an enquire_link_resp to any incoming enquire_link. If you don’t see the enquire_link_response, the session is likely to be dead. |