SMPP SMSC trunk settings reference

This reference describes the fields available when creating or editing an SMPP SMSC trunk. With this trunk type, DIDWW connects and binds to your SMSC as an ESME. The settings are grouped by the sections of the trunk form in the DIDWW User Panel.

For configuration steps, see Create an SMPP SMSC trunk or Manage SMPP SMSC trunks. This page covers trunk settings only. For protocol details, see the SMPP specification.

General settings

The General section identifies the trunk, selects the DIDWW SMPP server that binds to your SMSC, and defines the connection details and credentials of your SMSC. DIDWW uses these values when it binds to your SMSC. See Mandatory SMPP SMSC bind parameters.

Field	Availability	Description
Friendly name	Required	Unique name used to identify the trunk. For example, My SMPP SMSC SMS Trunk.
System type	Optional	Value that categorizes the type of ESME that binds to your SMSC. For example, VMS (voice mail system) or OTA (over-the-air activation system). DIDWW sends this value as the system_type bind parameter.
Server location	Required	DIDWW SMPP server that connects and binds to your SMSC: US, NY or NL, AMS. Your firewall must accept connections from the IP address of the selected location. See Server locations and IP addresses. When you change the location, DIDWW binds to your SMSC from the new location. Your SMSC connection details stay the same.
Password	Required	Password that your SMSC requires to authenticate the ESME during the bind. DIDWW sends this value as the password bind parameter.
System ID	Required	System ID that your SMSC requires to identify the ESME during the bind. DIDWW sends this value as the system_id bind parameter.
Host	Required	Public hostname or IP address of your SMSC. For example, smsc.example.com.
Use SSL	Optional	When on, DIDWW connects to your SMSC over TLS and establishes TLS before it sends the bind request. When off, DIDWW binds over plain TCP. TLS applies to the session on the TX port, and to the session on the RX port when Transceiver mode is off. Use SSL does not change the ports. Your SMSC must accept TLS connections on the ports you enter. Default: off.
Connection timeout	Optional	Time between TCP connection retries, in seconds. Range: 0 to 32767. Default: 20.
TX port	Optional	Port of your SMSC for the transmitter session, or for the single transceiver session when Transceiver mode is on. Range: 1 to 65535. Default: 2775.
RX port	Optional	Port of your SMSC for the receiver session when Transceiver mode is off. It is ignored when Transceiver mode is on. Range: 1 to 65535. Default: 2776. The default value is unrelated to TLS.
Transceiver mode	Optional	Defines how messages are exchanged between DIDWW and your SMSC. Off: DIDWW uses separate transmitter and receiver sessions. It sends bind_transmitter on the TX port and bind_receiver on the RX port. On: DIDWW uses a single transceiver session for two-way communication. It sends one bind_transceiver on the TX port. Default: off.

Source address settings

The Source Address Settings section controls which DID numbers can be used as the sender ID for outbound SMS.

Field	Availability	Description
Allow any DID(s) for SMS OUT	Optional	Controls how sender IDs are assigned. When the toggle is on, all DIDs with Outbound P2P SMS enabled in your account can be used as the sender ID. When the toggle is off, only the numbers in Allowed source addresses can be used. Default: on.
Available source addresses	Optional	DIDs that you can add to Allowed source addresses when Allow any DID(s) for SMS OUT is off. The list shows only DIDs that support outbound P2P SMS, with their Country, Number, and Description. Filters: Source address, Description, Country, and Region.
Allowed source addresses	Optional	DIDs that can be used as the sender ID when Allow any DID(s) for SMS OUT is off. Only the numbers in this list are available as sender IDs.

Trunk group settings

The optional Trunk Group Configuration section assigns the trunk to an existing SMS trunk group.

Field	Availability	Description
Assign to trunk group	Optional	Existing SMS trunk group to which the trunk is assigned.
Priority	Optional	Priority of the trunk within the selected trunk group. It determines the order in which trunks are used. The system attempts to contact the target SMS trunk with the highest-numbered priority first. Trunks with the same priority are tried in a random order. Range: 0 to 32767. Default: 1.

Related resources

• Create an SMPP SMSC trunk — Create a trunk and configure the settings described on this page.

• Manage SMPP SMSC trunks — Edit or delete an existing trunk.

• Accept SMPP SMSC bind requests — Prepare your SMSC to accept the bind parameters defined by these settings.

• SMPP SMSC trunk — Understand how DIDWW connects and binds to your SMSC.

• Assign an SMS trunk — Assign the trunk to one or more DID numbers to receive inbound SMS.

• SMPP specification — Review protocol details, including encoding, concatenation, and all available DIDWW endpoints.