This feature submits an SMS Over IP request to the SMSC.

Feature cheat sheet

Feature Name Network Operator Data Used in PlanId(s) Stateful or Stateless POJO Feature or SBB Feature




Stateless with FSM encoded into session state



MOSubmission statistics are tracked by the sentinel.ipsmgw SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.ipsmgw service → sentinel.ipsmgw SBB → feature → IPSMGWMOSubmission
or with rhino-stats:

Name Description

Incremented when OpenRequest is sent to SMSC


Incremented when the feature fails to send OpenRequest to SMSC


Incremented when a MO ForwardSMReq is sent to SMSC


Incremented when the feature gets the MO ForwardSMResp from SMSC


The feature is configured with configuration scoped according to a Sentinel Selection Key. The Profile Table used to hold feature configuration is IPSMGWSharedConfigProfileTable.

The following attributes are available

Attributes Type Meaning


Address of the HLR to request the MSRN from, used when establishing the MAP dialog



Contains a Template SMSC SCCP Address, where the digits are replaced by the received SMSC address



Address of Sentinel used when establishing the MAP dialog



The IP-SM-GW address that the feature will include it in MAP AnyTimeModification request to send to HLR



The timeout in milliseconds for the response from HLR. Used in the TCAP layer for the invoke timeout. Default is 5000



The maximum number of octets that a SMS message is allowed to contain to send the message as part of the TC_BEGIN as described below



If this array contains the value IEC_MO_PS, charging is enabled for MO submission flows.

MAP Application Context

The feature uses MAP Application Context shortMsgMO_RelayContext_v2_ac. This application context was added in GSM MAP Phase 2.


The feature is triggered upon receipt of a SIP Message request.

The feature first checks that the SIP Message request’s Content-Type header is "application/vnd.3gpp.sms". If not, the feature finishes execution.

If the SIP Message request has a Content-Type header of "application/vnd.3gpp.sms" the feature extracts the body and parses it into an RP Message of the appropriate type. If the RP Message can be parsed, the feature extracts the SMSC address from the parsed RP Message. The feature then extracts the SMSC Address from the parsed RP Message. The further behaviour of the feature depends on whether online charging is enabled or not. If online charging is not enabled the feature immediately sends a 202 Accepted response to the SIP Message request, otherwise it will only send it after a successful online charging response.

sms submission initial

Once the SMS has been accepted, the feature passes the SMS into the SMSC. This is through the use of the MAP MO Forward SM operation, on the shortMsgMO_RelayContext_v2_ac MAP Application Context.

A general overview of the feature behaviour is depicted in the diagram below.

sms submission overview

Submitting the SMS to the SMSC

There are two different flows where the feature can submit the SMS. Note both of these flows assume that the 202 response above has been sent.

The first is for an SMS that is sufficiently small according to the configured SmsContentSizeThreshold attribute to fit both the MAP_OPEN request and content of the MAP_MO_FORWARD_SHORT_MESSAGE request in a single TCAP Message.

sms submission smallsms

The second is for an SMS that is too large to fit both the MAP_OPEN request and content of the MAP_MO_FORWARD_SHORT_MESSAGE request in a single TCAP Message.

sms submission largesms

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Sentinel IP-SM-GW Version 4.0.0