Telephony Integrations
Telephony providers connect your voice agents to the phone network so they can make and receive real calls. Bolna supports managed integrations with major carriers as well as bring-your-own-carrier via SIP trunking, giving you full control over call routing, number provisioning, and cost.
Exotel
Exotel lets a Bolna voice agent make and answer phone calls in India on your own ExoPhones, routed and billed through your Exotel account.
Plivo
Plivo connects a Bolna voice agent to Indian phone numbers for inbound and outbound calls. Buy a number in Bolna or bring your own Plivo account.
Twilio
Twilio lets a Bolna voice agent make and answer phone calls outside India. Buy a US number in Bolna or connect your own Twilio account and numbers.
Vobiz
Vobiz gives a Bolna voice agent Indian phone numbers for inbound and outbound calls. Buy a Vobiz number in Bolna after KYC, or connect your own account.
Acefone SIP Trunking
Connect Acefone to a Bolna voice agent as a Custom SIP trunk, so the agent answers and places calls on your Acefone numbers while Acefone bills the minutes.
Airtel SIP Trunking
Connect an Airtel Business SIP trunk to a Bolna voice agent as a Custom trunk, so the agent answers and places calls on your Airtel numbers at your Airtel rates.
Exotel SIP
Connect an Exotel SIP trunk to a Bolna voice agent with Bolna's Exotel preset, so the agent answers and places calls on your Exotel numbers at your Exotel rates.
Generic SIP Trunk
Connect any SIP carrier to a Bolna voice agent with a SIP trunk, then answer and place AI calls on your own numbers at your own carrier rates over UDP or TCP.
Plivo SIP Trunking
Connect Plivo Zentrunk SIP trunks to a Bolna voice agent so it answers and places calls on your Plivo numbers through Plivo's own inbound and outbound trunks.
Telnyx SIP Trunking
Connect Telnyx to a Bolna voice agent with an FQDN SIP connection and the Telnyx preset, so the agent answers and places calls on your Telnyx numbers.
Twilio SIP Trunking
Connect a Twilio Elastic SIP Trunk to a Bolna voice agent so it answers and places calls on your Twilio numbers, with Twilio carrying and billing the minutes.
Vobiz SIP Trunking
Connect Vobiz SIP trunks to a Bolna voice agent so it answers and places calls on your Vobiz numbers in India, using Vobiz inbound and outbound trunks.
VoiceLink SIP Trunking
Connect VoiceLink to a Bolna voice agent as a Custom SIP trunk on port 3300, so the agent answers and places calls on your VoiceLink numbers in India.
Vonage SIP Trunking
Connect a Vonage SIP trunk to a Bolna voice agent with the Vonage preset, so the agent answers and places calls on your Vonage numbers at your Vonage rates.
Telephony providers on Bolna compared
| Provider | Regions | Inbound/outbound | Best for |
|---|---|---|---|
| Plivo | India and global | Both | Most Bolna deployments; Indian numbers can be bought from the Bolna dashboard |
| Exotel | India | Both | Indian businesses that want strong local support and built-in DLT compliance |
| Vobiz | India | Both | Calls within India at competitive rates; Indian numbers can be bought in Bolna after KYC |
| Twilio | United States, United Kingdom, Singapore, Australia and more | Both | Calls outside India; widest geographic reach |
| Your own SIP trunk | Any, depending on your carrier | Both | Keeping your current carrier, numbers and rates; presets for Plivo, Telnyx, Twilio, Exotel, Vobiz and Vonage, plus Custom for any SIP carrier over UDP or TCP (Acefone, Airtel, VoiceLink and others) |
For the full guide, see Choosing a telephony provider in the Bolna docs.
Frequently asked questions
Yes. You can buy US numbers (through Twilio) and Indian numbers (through Plivo or Vobiz) from the Bolna dashboard for $5 per month each. Indian numbers need compliance verification before they are activated.
Yes. All four support bringing your own account for both inbound and outbound calls. Add your credentials in Settings → Integrations in the Bolna dashboard.
Yes. Any carrier that speaks standard SIP over UDP or TCP works, with presets for Plivo, Telnyx, Twilio, Exotel, Vobiz and Vonage and a Custom option for others. Your carrier sends calls to trunk.bolna.ai and allowlists Bolna's IPs 15.252.21.46 and 13.206.230.198, and your agents then answer and place calls on your own numbers at your carrier's rates.
Use Twilio. Bolna recommends it for making or receiving calls outside India, and it has the widest geographic reach of the managed providers.
Yes. Plivo and Exotel use linear16 audio at 16000 Hz, and Twilio uses mulaw at 8000 Hz. Match your transcriber encoding, sampling rate and voice audio format to the provider, or transcription accuracy drops.
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