Telephony for AI
Building a voice assistant, a booking service or your own dialler? A Viatel SIP trunk connects your calling platform to the telephone network for inbound and outbound calls.
Operator registered with Sweden's PTS
Direct connections to Telia, Tele2, Tre and Telenor
Port your existing numbers
Your AI. Our telephony.
We connect the calls. You build the service.
Viatel provides Swedish phone numbers and the SIP connection to the telephone network. Your platform handles AI, speech recognition, text-to-speech and what happens during the call.
Use cases
When your AI service needs to make and receive calls
For businesses developing or integrating their own voice service. These examples show possible setups using your application and Viatel's telephony.
A voice service on your number
Customers call your Swedish number to ask questions or book an appointment. Your AI platform receives the call.
Follow-up calls from your application
Let your service call the customer to follow up on a booking or an enquiry.
Telephony in your own product
Building a calling service for several businesses? Connect telephony to the product you are developing.
AI in your existing call flow
Use a SIP-compatible AI service in your existing call flow, for example to receive calls before transferring them.
HD audio for AI calls
Clearer audio for speech recognition
Our SIP trunk supports HD audio with G.722. It preserves more detail in the voice, giving speech recognition better audio to work with when transcribing calls.
HD audio with G.722
Clearer audio when callers spell out details
We test the audio with your AI platform
HD audio requires the phone, the call path and your AI platform to support the right audio format.
Illustrative audio demo with a synthetic voice. The same source in two audio formats.
Connection requirements
Start with your platform and call flow
Tell us what you are building and send your platform's technical documentation. We review the connection requirements before you order.
SIP, audio and network connection
Our standard connection uses SIP over UDP and RTP and is based on a fixed IP address that you control. G.722 is supported for HD audio. Your platform’s audio formats, transport and authentication are checked during setup.
Destinations and call traffic
We review the countries your service needs to call and the number of concurrent calls. Your requirements determine the setup.
Numbers and administration
Get new Swedish landline numbers or port your existing numbers. We review number administration and API requirements based on your needs.
SIP trunk pricing
One rate for calls across Sweden.
SEK/min
To Swedish mobile and landline numbers.
connection fee per call
Outgoing calls in the Nordic region
Sweden
SEK 0.39/min
Norway and Denmark
SEK 0.49/min
Finland
SEK 0.59/min
Example: 1,000 billed minutes to Swedish landline and mobile numbers cost SEK 390 in call charges. A setup fee and a fixed monthly fee also apply.
Get a quote for your call volume.
Rates apply to outgoing calls to landline and mobile numbers. Incoming calls: SEK 0.05/min, excluding Swedish 020 numbers. All prices are in SEK and exclude VAT. Phone numbers, add-ons and your AI platform are priced separately.
Frequently asked questions
Questions about telephony for AI
Can't find the answer? Get in touch.
Is the AI assistant included?
Viatel provides phone numbers and the SIP connection to the telephone network. You choose and run the AI platform, speech recognition, speech synthesis and application logic.
Does it work with Vapi, Retell or ElevenLabs?
That depends on the platform's SIP support and connection requirements. Tell us which platform you use and send its technical documentation. We review transport, audio formats, authentication and IP addresses for your setup before testing.
Can our AI receive calls and make outbound calls?
A SIP trunk supports both inbound and outbound calls. Numbers, routing, caller ID and capacity need to be configured and tested for your platform.
Do we need a fixed IP address?
Viatel's documented SIP trunk uses a fixed IP address controlled by the customer. If your AI platform uses shared or changing addresses, we need to review how the connection and customer identification will work.
What does telephony for an AI service cost?
Outgoing calls to Swedish landline and mobile numbers cost SEK 0.39/min. Calls to Norway and Denmark cost SEK 0.49/min, and calls to Finland cost SEK 0.59/min. The connection fee is SEK 0 per call to all countries. Incoming calls cost SEK 0.05/min, excluding Swedish 020 numbers. A setup fee and a fixed monthly fee also apply. Phone numbers, add-ons and your AI platform are priced separately. All prices exclude VAT.
Does all data stay in Sweden?
Viatel's telephony runs in Swedish data centres. Where audio, transcripts and other data are processed elsewhere in the chain depends on your chosen AI platform and services. The complete setup needs to be assessed together.