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DTMF: carrying keypad choices through a phone call

Updated 2026-10-30 · Prepared by Call Global Communications Inc

Short answer: Dual-Tone Multi-Frequency signaling represents the digits pressed on a telephone keypad. Automated menus depend on receiving those digit events in a format they understand.

SIP systems can carry keypad input through RTP events such as RFC 2833 or through SIP INFO. A mismatch can make a connected call ignore menu selections.

Use the definition to check your setup

Dual-Tone Multi-Frequency signaling represents the digits pressed on a telephone keypad. Automated menus depend on receiving those digit events in a format they understand.

SIP systems can carry keypad input through RTP events such as RFC 2833 or through SIP INFO. A mismatch can make a connected call ignore menu selections.

DTMF: carrying keypad choices through a phone call — points to check

Review pointCallGlobal guidance
ConceptDual-Tone Multi-Frequency signaling represents the digits pressed on a telephone keypad. Automated menus depend on receiving those digit events in a format they understand.
Configuration implicationSIP systems can carry keypad input through RTP events such as RFC 2833 or through SIP INFO. A mismatch can make a connected call ignore menu selections.
Product boundaryConsult the feature list; a glossary term does not identify an included capability.

Where the CallGlobal line fits

Your number account provides the public telephone identity, its communication controls and the SIP credentials for compatible software. Other capabilities belong to the application or phone system you choose.

Review the live product feature list before relying on an additional function. Number porting, hosted IVR, voicemail, call recording and a public customer API are not included.

Protect the line and the account

  • Keep account and SIP passwords private, including in support screenshots.
  • Confirm the active rental term before relying on incoming communication.
  • Use the complete international number and only an authorized caller identity.

Frequently asked questions

What does this term describe?

Dual-Tone Multi-Frequency signaling represents the digits pressed on a telephone keypad. Automated menus depend on receiving those digit events in a format they understand.

How does this affect practical configuration?

SIP systems can carry keypad input through RTP events such as RFC 2833 or through SIP INFO. A mismatch can make a connected call ignore menu selections.

Does every telephone concept name an included product feature?

No. A glossary explains terminology. The product feature page and your number dashboard identify the functions provided with a CallGlobal line.

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