Name

AVP Code

Data Type

Vendor

Destination-SIP-URI

3327

UTF8String

3GPP

Сontains the Public Identity of an IMS UE (User Equipment) when delivering a short message (SMS) in an MSISDN-less environment. This AVP is used in the context of SMS delivery over IMS, as defined in 3GPP [TS 23.204]. The AVP represents the destination SIP URI of the recipient UE in IMS-based SMS delivery.

It is used when an MSISDN (Mobile Subscriber ISDN Number) is not available, ensuring proper message routing. This AVP is primarily used in SGd interface signaling between the SMS Function (SMSF) and the Mobility Management Entity (MME) or Access and Mobility Management Function (AMF) in 5G networks.

HSS-ID

3325

UTF8String

3GPP

Uniquely identifies a Home Subscriber Server (HSS) within an IMS or 5G Core network. The definition and composition of the HSS-ID are specified in 3GPP [TS 23.003].

The HSS is responsible for storing and managing subscriber profiles, including authentication, service authorization, and mobility management.

This AVP is typically used in Diameter-based interfaces, such as SGd, Cx, and Sh, to enable network functions (e.g., SMSF, MME, AMF, or other core elements) to identify the specific HSS handling a subscriber.

Maximum-Retransmission-Time

3330

Time

3GPP

Specifies the maximum retransmission time (in UTC) until which the SMS-GMSC (Short Message Service Gateway Mobile Switching Center) is capable of retransmitting a Mobile-Terminated (MT) Short Message. This AVP ensures that the validity period for message retransmission is clearly defined, allowing the SMS-GMSC to attempt redelivery within the specified timeframe. It is used within Diameter signaling over the SGd interface, as defined in 3GPP [TS 29.338].

OFR-Flags

3328

Unsigned32 (Bitmask)

3GPP

Contains a bitmask used to indicate specific conditions related to the Originating Fallback Request (OFR) message in Diameter-based messaging over the SGd and Gdd interfaces. The bit definitions within this AVP are specified in Table 6.3.3.12/1 of 3GPP [TS 29.338].

Currently, this AVP includes the following bit:

0: S6a/S6d-Indicator: When set, it indicates that the OFR message is sent on the Gdd interface, meaning the source node is an SGSN (or a combined MME/SGSN to which the UE is attached via UTRAN). When cleared, it indicates that the OFR message is sent on the SGd interface, meaning the source node is an MME (or a combined MME/SGSN where the UE is attached via UTRAN or GERAN).

This AVP is primarily used for differentiating between SGd and Gdd interfaces in fallback procedures for SMS over IMS and non-IMS networks.

Originating-SIP-URI

3326

UTF8String

3GPP

Contains the Public Identity of an IMS UE (User Equipment) that is the sender of a short message (SMS) in an MSISDN-less environment. This AVP is used in the context of SMS delivery over IMS, as specified in 3GPP [TS 23.204].

It represents the originating SIP URI of the sender UE in IMS-based MSISDN-less SMS delivery.

Used in cases where the IMS network delivers SMS messages without relying on MSISDN-based addressing.

Requested-Retransmission-Time

3331

Time

3GPP

Specifies the exact timestamp (in UTC) at which the SMS-GMSC (Short Message Service Gateway Mobile Switching Center) is requested to retransmit a Mobile-Terminated (MT) Short Message. This AVP is used to control message retransmission timing in IMS and non-IMS-based SMS delivery mechanisms.

It ensures that an MT Short Message is retransmitted at a specific, scheduled time rather than relying on a general retry mechanism.

This AVP is typically used over the SGd interface, as defined in 3GPP [TS 29.338].

SC-Address

3300

OctetString (E.164 Number)

3GPP

Contains the E.164 number of the Short Message Service Center (SMS-SC) or the Mobile-Terminated Call Interworking Function (MTC-IWF). The number is formatted according to ITU-T Recommendation E.164 and encoded as a TBCD-string, following the encoding rules specified in 3GPP [TS 29.002].

This AVP is used in SGd interface signaling between the SMS Function (SMSF), MME, AMF, and SMS-GMSC for short message delivery and routing.

The SC-Address represents the network element responsible for handling SMS services, ensuring correct routing of Mobile-Originated (MO) and Mobile-Terminated (MT) SMS messages.

Encoding Rules:

• The address is encoded as a TBCD-string (Telephony Binary-Coded Decimal).

• No leading indicators for the nature of the address or numbering plan should be included.

• The AVP should contain only the TBCD-encoded digits of the E.164 address.

SM-Delivery-Failure-Cause

3303

Grouped

3GPP

Contains information about the cause of failure for the delivery of a Short Message (SM). This AVP is primarily used in Diameter-based SMS signaling to report delivery failures to the SMS-GMSC (Short Message Service Gateway Mobile Switching Center) or SMS Function (SMSF).

The AVP structure is defined as follows:

SM-Enumerated-Delivery-Failure-Cause (Mandatory): Specifies the reason for SMS delivery failure using predefined enumerated values (e.g., UE Unreachable, Network Failure, Memory Capacity Exceeded).

SM-Diagnostic-Info (Optional): Provides additional diagnostic information about the failure (e.g., network error details, retry conditions).

SM-Delivery-Start-Time

3307

Time

3GPP

Contains the timestamp (in UTC) at which the Short Message (SM) Delivery Supervision Timer was started. This AVP is used to track the initiation time of the SMS delivery supervision process in IMS, LTE, and 5G networks.

Helps determine whether the SMS delivery window has expired, aiding in supervision and retry mechanisms.

SM-Delivery-Timer

3306

Unsigned32

3GPP

Specifies the time duration (in seconds) for the Short Message (SM) Delivery Supervision Timer. This timer defines the maximum allowable time for attempting the delivery of a short message before it is considered expired or unsuccessful.

SM-Diagnostic-Info

3305

OctetString

3GPP

Contains complementary information related to an SM (Short Message) Delivery Failure Cause. It provides additional diagnostic details to help identify the specific reason for an unsuccessful SMS delivery attempt. This AVP is used in conjunction with the SM-Delivery-Failure-Cause AVP (3303) to provide extended failure information.

The content of this AVP may include network error details, retry recommendations, or other debugging data.

SM-Enumerated-Delivery-Failure-Cause

3304

Enumerated

3GPP

Specifies the reason for the failure of a Short Message (SM) delivery. The values defined for this AVP correspond to the SM-EnumeratedDeliveryFailureCause parameter in MAP, as described in 3GPP [TS 29.002]. This AVP is typically included in the SM-Delivery-Failure-Cause AVP (3303) to provide a structured, standardized failure cause that can be interpreted by network entities.

Enumerated Values:

0 MEMORY_CAPACITY_EXCEEDED: The recipient device has insufficient memory to store the incoming message.

1 EQUIPMENT_PROTOCOL_ERROR: A protocol error occurred at the recipient's device.

2 EQUIPMENT_NOT_SM_EQUIPPED: The recipient's device does not support Short Message (SM) services.

3 UNKNOWN_SERVICE_CENTRE: The Service Center (SC) handling the message is unknown or unrecognized.

4 SC_CONGESTION: The Service Center (SC) is experiencing congestion and cannot process the message.

5 INVALID_SME_ADDRESS: The destination address of the Short Message Entity (SME) is invalid.

6 USER_NOT_SC_USER: The recipient is not registered as an SMS user for the given Service Center.

SM-RP-UI

3301

OctetString

3GPP

Contains a Short Message Transfer Protocol Data Unit (TPDU), as defined in 3GPP [TS 23.040]. Represents the user data field carried by the Short Message Service (SMS) relay sub-layer protocol. This AVP encapsulates the actual SMS content being transmitted. The maximum length of this AVP is 200 octets. 

SMS-GMSC-Address

3332

OctetString (E.164 Number)

3GPP

Contains the E.164 number of the SMS-GMSC (Short Message Service Gateway Mobile Switching Center) or an SMS Router. The number is formatted according to ITU-T Recommendation E.164 and encoded as a TBCD-string, following the encoding rules specified in 3GPP [TS 29.002].

The SMS-GMSC acts as an intermediary network element, responsible for storing and forwarding SMS messages when the recipient is temporarily unavailable.

It ensures that messages are correctly routed from the originating SMS function to the destination mobile subscriber.

SMSMI-Correlation-ID

3324

Grouped

3GPP

Used in the context of MSISDN-less SMS delivery in IMS. It contains identity-related information necessary to correlate an SMS session when the MSISDN (Mobile Subscriber ISDN Number) is not used. This AVP facilitates SMS routing and correlation in IMS-based messaging environments, as specified in 3GPP [TS 23.204].

The AVP structure is defined as follows:

HSS-ID (Optional): Identifies the Home Subscriber Server (HSS) handling the subscriber.

Originating-SIP-URI (Optional): Contains the SIP URI of the sender (IMS UE) of the short message.

Destination-SIP-URI (Optional): Contains the SIP URI of the recipient (IMS UE) of the short message.

Allows inclusion of additional attributes defined as AVPs, enabling extensibility for future enhancements or vendor-specific attributes.

TFR-Flags

3302

Unsigned32 (Bitmask)

3GPP

Contains a bitmask used to indicate specific conditions related to the Transfer Request (TFR) message in Diameter-based messaging over the SGd interface. The bit definitions within this AVP are specified in Table 6.3.3.4/1 of 3GPP [TS 29.338].

Currently, this AVP includes the following bit:

0: More-Messages-To-Send: When set, it indicates that the Service Center (SC) has more short messages to send.

NOTE: Bits not defined in this table must be cleared by the sending entity and discarded by the receiving entity.