Question

question 4

you are configuring a voip system and want to ensure that the system can handle calls to and from traditional landline and mobile phones.

you know you need to implement a specific feature that allows voip endpoints to dial these external numbers.

which feature should you ensure is included in the voip system configuration to meet this requirement?

a the inclusion of a tel: uri scheme
b the implementation of qos
c the activation of sip-tls
d the use of rtp streams

Explanation:

Identify the core requirement

The goal is to allow VoIP endpoints to dial external numbers like traditional landlines and mobile phones.

Analyze the options

• Option A (tel: URI scheme): The tel: URI scheme is specifically designed for telephone numbers, allowing VoIP systems to route calls to the Public Switched Telephone Network (PSTN) for landlines and mobiles.
• Option B (QoS): Quality of Service (QoS) manages network traffic to reduce packet loss and latency, but it does not enable dialing external numbers.
• Option C (SIP-TLS): Transport Layer Security for SIP (SIP-TLS) encrypts signaling traffic, providing security rather than routing capabilities to external networks.
• Option D (RTP streams): Real-time Transport Protocol (RTP) carries the actual audio/video media streams once a connection is established, but it does not handle the dialing or routing of telephone numbers.

Determine the correct feature

To dial traditional telephone numbers from a VoIP system, the system must support a telephone-specific addressing format. The tel: URI scheme (defined in RFC 3966) represents a telephone number, enabling integration with traditional telecommunication networks.

Answer:

• (A) The inclusion of a tel: URI scheme (Correct answer)
• (B) The implementation of QoS
• (C) The activation of SIP-TLS
• (D) The use of RTP streams