Having an SMS termination failure may occur for various reasons:

  • Incorrect number formats, missing international codes, and mis-typed numbers.

  • Numbers do not exist or have expired.

  • Receiving network is overloaded.

  • Receiving network failure.

  • Receiving phones are switched off 

  • Inbox of receiving phones are full.

  • Not supporting a DLR feature.

  • Sender ID is not registered [For destinations that require Sender ID registration].

  • SMS content is restricted over this Network/ Route Type.

  • The account is facing credit issues (for pre-paid accounts only).

  • Terminating messages to restricted networks/countries.

  • The SMS length is invalid or noncompatible with the interface.


Success Ratio = 

Number of Delivered SMS Attempts x100

Number of All SMS Attempts

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