Which two extended capabilities must be configured on dial peers for fast start-to-early media scenarios (H.323 to SIP interworking)? (Choose two.)

The correct answer is A. DTMF. For H.323 fast-start to SIP early media interworking, extended capabilities on dial peers ensure that the voice gateway can properly translate and pass media-related information between the two protocols during early call stages (before the call is fully connected). DTMF (Answer

Cisco Unified Border Element

Question

Which two extended capabilities must be configured on dial peers for fast start-to-early media scenarios (H.323 to SIP interworking)? (Choose two.)

Options

ADTMF
BBFCP
CVIDEO
DFAX

How the community answered

(42 responses)

A
86% (36)
B
10% (4)
C
2% (1)
D
2% (1)

Explanation

For H.323 fast-start to SIP early media interworking, extended capabilities on dial peers ensure that the voice gateway can properly translate and pass media-related information between the two protocols during early call stages (before the call is fully connected). DTMF (Answer A) must be included as an extended capability so that DTMF negotiation is carried across the interworking boundary, enabling digit collection before call answer. The second required capability (typically VIDEO or another media type depending on the deployment) ensures that the fast-start media channel advertisements are properly mapped. BFCP is used for floor control in collaboration sessions and is not relevant here. FAX is a separate media mode not related to early media interworking.

Topics

#Dial Peer Configuration#H.323-SIP Interworking#Early Media#DTMF Relay

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