Amazon Chime SDK PSTN Audio vs Infobip Voice API

Amazon Chime SDK PSTN Audio8.8Visit Infobip Voice API7.1Visit

Higher score Amazon Chime SDK PSTN Audio #7 in Voice APIs 8.8/10 Paid ✓ 5 of 5 features Visit AWS

vs

Infobip Voice API #24 in Voice APIs 7.1/10 60-day trial Free trial✓ 5 of 5 features Visit Infobip

• Amazon Chime SDK PSTN Audio fits best

  AWS developers adding PSTN call flows

• Infobip Voice API fits best

  Teams wanting a long trial and broad voice tools

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Side by side

Feature	Amazon Chime SDK PSTN Audio 8.8/10 Visit ↗	Infobip Voice API 7.1/10 Visit ↗
At a glance
Editor score	8.8	7.1
Ranking	#7 in Voice APIs	#24 in Voice APIs
Best for	AWS developers adding PSTN call flows	Teams wanting a long trial and broad voice tools
Pricing model	Paid	Paid
Starting price	$0.002/unit usage-based	60-day trial
Free plan	—	—
Free trial	—	60 days
Deployment	Cloud	Mobile, Cloud
Platforms	Web	iOS, Android, Web
Integrations	4 integrations	3 integrations
Features Amazon Chime SDK PSTN Audio 5/5 · Infobip Voice API 5/5
Inbound calling	✓	✓
Outbound calling	✓	✓
Phone number support	✓	✓
SIP support	✓	✓
Call recording	✓	✓
Specs
Concurrent call limit	10 calls	Not checked yet
SDK languages	JavaScript, Swift, Objective-C, Kotlin, Java, C++	JavaScript, Python, Java, Go, PHP, C#, Ruby
Our review
Pros	Inbound and outbound calling with provisioned and toll-free numbers Lambda-controlled flows with DTMF, prompts, routing, and bridging Recording, noise suppression, and integrations across AWS services	Supports inbound and outbound calls across PSTN, WebRTC, and SIP Combines IVR, conferencing, recording, streaming, transcription, and TTS Offers API, web, iOS, and Android access with multiple SDK languages
Cons	API-only coverage requires development work for end-user applications Usage-based billing spans calling, phone numbers, and connected AWS services The default regional active-call quota is 10 concurrent calls	No free plan is available after the trial Pay-as-you-go pricing varies by country and currency The broad feature set may exceed basic calling requirements
Our verdict	Amazon Chime SDK PSTN Audio is an API service for developers building serverless telephony applications on AWS. It supports inbound calls on provisioned DID/DDI and toll-free numbers, outbound calls to landline and mobile numbers in over… Read the review →	Infobip Voice API provides programmable communications for businesses and developers building voice applications. It supports inbound and outbound calls across PSTN, WebRTC, and SIP, with voice-number provisioning, IVR, click-to-call,… Read the review →

Strengths and trade-offs

• Amazon Chime SDK PSTN Audio — where it wins

  • Inbound and outbound calling with provisioned and toll-free numbers
  • Lambda-controlled flows with DTMF, prompts, routing, and bridging
  • Recording, noise suppression, and integrations across AWS services

  Where it doesn't

  • API-only coverage requires development work for end-user applications
  • Usage-based billing spans calling, phone numbers, and connected AWS services
  • The default regional active-call quota is 10 concurrent calls

• Infobip Voice API — where it wins

  • Supports inbound and outbound calls across PSTN, WebRTC, and SIP
  • Combines IVR, conferencing, recording, streaming, transcription, and TTS
  • Offers API, web, iOS, and Android access with multiple SDK languages

  Where it doesn't

  • No free plan is available after the trial
  • Pay-as-you-go pricing varies by country and currency
  • The broad feature set may exceed basic calling requirements

• Amazon Chime SDK PSTN Audio8.8/10 · Paid

  A focused AWS building block for developers creating programmable PSTN call flows.

  Visit AWSFull verdict →
• Infobip Voice API7.1/10 · 60-day trial

  A broad voice API suite with a 60-day trial and pay-as-you-go pricing.

  Visit InfobipFull verdict →