What is a Fixed sender ID?

Fixed sender ID is a predetermined numeric sender identification that cannot be modified according to user needs and follows the standard MSISDN format.

The ITU Telecommunication Standardization Sector recommendations limit the maximum length of an MSISDN to 15 digits. 1-3 numbers are reserved for country codes with prefixes not included.

ITU Telecommunication Standardization Sector does not specify the minimum length of the MSISDN but is defined in the national numbering plans by the telecommunications regulator in each country.

How does Fixed sender ID work?

Fixed sender ID assigns a specific telephone number or sender ID to a business’s messaging platform. This number is associated with each sent message, allowing customers to identify the sender.

It is the mobile number displayed on the recipient’s cell phone along with the content of the message. This allows easier identification, increased engagement, and trust between businesses and customers.

What are the variations of sender IDs?

Sender IDs can be:

  • Fully dynamic – any sender ID that does not exceed XX characters and uses the following characters: 1234567890abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
  • Dynamic alpha – any sender ID up to 11 characters with only letters
  • Dynamic numeric – any sender ID up to 15 characters using phone numbers
  • Random numeric – is activated on request and is random numbers that comply with local regulations
  • Fixed sender ID – can be numeric or alpha

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Jan 6th, 2022
2 min read

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