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How Safina connects SIP and PSTN for intelligent call management

Learn how Safina connects PSTN and VoIP with Twilio Elastic SIP Trunking to manage calls intelligently – securely, scalably, and powered by AI.

Minimalistic vector graphic. Two different symbols: on the left, a simple grid made of small dots representing a traditional network; on the right, a series of clear, curved lines representing a digital network, connected by a single bold line in the middle, on a white background.

Insight

S as a symbol for the logo of the AI phone assistant Safina AI
Minimalistic vector graphic. Two different symbols: on the left, a simple grid made of small dots representing a traditional network; on the right, a series of clear, curved lines representing a digital network, connected by a single bold line in the middle, on a white background.

Insight

S as a symbol for the logo of the AI phone assistant Safina AI
Minimalistic vector graphic. Two different symbols: on the left, a simple grid made of small dots representing a traditional network; on the right, a series of clear, curved lines representing a digital network, connected by a single bold line in the middle, on a white background.

Insight

S as a symbol for the logo of the AI phone assistant Safina AI

How Safina Connects SIP and PSTN for Intelligent Call Management: A Technical Insight

In today's fast-paced business world, efficient call management is more important than ever. A high call volume can overwhelm teams – resulting in missed opportunities and frustrated customers. Imagine: Every call is answered immediately, intelligently addressed, and transformed into structured data – without a staff member needing to pick up the receiver. That's what Safina makes possible.

The Two Worlds: PSTN vs. SIP

Feature

PSTN (Traditional)

SIP (Modern)

Network Type

Circuit-switched

Packet-switched (IP-based)

Technology

Physical telephone lines, exchanges

Internet Protocol (VoIP)

Advantages

Very reliable, universally available

Flexible, cost-effective, scalable, feature-rich

Disadvantages

Expensive to scale, no modern features

Requires a stable internet connection

Typical Use

Landline and mobile telephony

Cloud telephony, video calls, messaging

The Bridge: Twilio Elastic SIP Trunking

A SIP trunk is the virtual version of a phone line. It connects your phone system (e.g., Safina) to the PSTN – and vice versa. Safina relies on Twilio Elastic SIP Trunking because of:

  • Global Reach

  • High Reliability

  • Robust APIs for deep integration

How It Works – Step by Step

  1. Call Initiation: A customer dials your business number (managed by Twilio) – the call comes from the PSTN.

  2. PSTN to SIP Conversion: Twilio receives the call and converts the signaling into SIP format.

  3. SIP Transmission: Twilio forwards the call over the internet to Safina's servers – securely and directly.

  4. Safina Takes Over:

    • Real-time transcription

    • intent recognition (NLU)

    • Dynamic, human-like responses

    • Tasks like booking appointments or answering FAQs

All of this happens in milliseconds – for a seamless caller experience.

Technical Implementation at Safina

Aspect

Safina Implementation

Network Connectivity

Accepts signaling & media data from all Twilio IP ranges for redundancy

Number Format

E.164 standard (+49301234567) for global compatibility

Security

TLS for signaling, SRTP for media encryption

Codecs

G.711 for PSTN, Opus for VoIP

Disaster Recovery

Fallback URLs for uninterrupted accessibility

Why This Matters for Your Business

  • Universal Accessibility: Anyone can call you – whether from landline, mobile, or VoIP.

  • Intelligent Call Processing: Every call is enriched with AI features.

  • Scalability & Cost Savings: Adjust capacity flexibly, save on hardware costs.

  • Global Presence: Set up international numbers instantly and respond locally.

Conclusion

The connection of SIP and PSTN is the foundation for Safina to function as a modern, intelligent phone assistant. With Twilio Elastic SIP Trunking, we ensure that every call – no matter the source – is handled securely, reliably, and supported by AI.

Two smartphone screens with the Safina AI app. On the left is a detailed call summary with key points, a callback button, and AI evaluations such as mood, urgency, and interest. On the right is a call statistics overview for the last week, showing trusted, suspicious, and dangerous calls, as well as a list of recent calls.

Say goodbye to your old-fashioned voicemail!

Try Safina for free and start managing your calls intelligently.

Try for free

Two smartphone screens with the Safina AI app. On the left is a detailed call summary with key points, a callback button, and AI evaluations such as mood, urgency, and interest. On the right is a call statistics overview for the last week, showing trusted, suspicious, and dangerous calls, as well as a list of recent calls.

Say goodbye to your old-fashioned voicemail!

Try Safina for free and start managing your calls intelligently.

Try for free

Two smartphone screens with the Safina AI app. On the left is a detailed call summary with key points, a callback button, and AI evaluations such as mood, urgency, and interest. On the right is a call statistics overview for the last week, showing trusted, suspicious, and dangerous calls, as well as a list of recent calls.

Say goodbye to your old-fashioned voicemail!

Try Safina for free and start managing your calls intelligently.

Try for free

Two smartphone screens with the Safina AI app. On the left is a detailed call summary with key points, a callback button, and AI evaluations such as mood, urgency, and interest. On the right is a call statistics overview for the last week, showing trusted, suspicious, and dangerous calls, as well as a list of recent calls.

Say goodbye to your old-fashioned voicemail!

Try Safina for free and start managing your calls intelligently.

Try for free

Safina Docs

How Safina connects SIP and PSTN for intelligent call management