# SessionTalk SIP Softphone vs Castel SIP

The clearest difference is in-app purchases: Castel SIP at none against SessionTalk SIP Softphone's 2. Castel SIP also leads on review sentiment (60% vs 39%). SessionTalk SIP Softphone's advantage is update cadence (every 4 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SessionTalk SIP Softphone sells 2 one-off in-app purchases. Castel SIP asks for nothing beyond the download.

SessionTalk SIP Softphone ships an update every 4 days, Castel SIP every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | SessionTalk SIP Softphone | Castel SIP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (1K ratings)](https://appshunter.io/ios/app/sessiontalk-sip-softphone/id362501443/reviews)** | — |
| Number of ratings | **1K** | — |
| Positive reviews | 39.2% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 64 MB | 84 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [SessionTalk Ltd](https://appshunter.io/developer/357429375) | [Castel](https://appshunter.io/developer/566301834) |

## What reviewers say

### SessionTalk SIP Softphone

[App page](https://appshunter.io/ios/app/sessiontalk-sip-softphone/id362501443)

This app brings your business SIP account to your mobile device, offering voice calling, messaging, and video. An optional upgrade unlocks advanced features like call recording, multiple accounts, and enhanced security.

**Highlights:** SIP voice calling, XMPP chat and messaging, Video calling, Multiple SIP account management, Call recording and transfer, ZRTP audio encryption

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| G.729 Annex A Codec | $2.99 | one-time |
| Upgrade to Pro | $6.99 | one-time |

**What reviewers like**

- 🚀 Works well
- 👍 Easy to set up
- 🔒 Secure
- 🔋 Doesn't drain battery
- 👍 Good call quality

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Doesn't work with some providers
- 🐛 Push notifications not working
- 🐛 Doesn't work in background
- 🐛 Incompatible with newer iOS versions

**Reported bugs**

- Incoming calls not working
- Calls dropping
- Connectivity issues
- Keypad not working properly

**Requested features**

- Scheduled DND mode
- Improved iPad support
- Video calling
- More codec support


### Castel SIP

[App page](https://appshunter.io/ios/app/castel-sip/id566301831)

This application functions as a SIP intercom softphone, enabling users to make and receive audio and video calls from IP intercom stations on their mobile devices. It allows for communication and remote door opening, working through Wi-Fi and cellular data networks.

**Highlights:** Audio and video calls, IP intercom station integration, Remote door opening, Address book with favorites, Call history, Remote commands during calls

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SessionTalk SIP Softphone free?

SessionTalk SIP Softphone is free to download, with in-app purchases available.

### Is Castel SIP free?

Castel SIP is free to download, with no in-app purchases.

### Do SessionTalk SIP Softphone or Castel SIP have ads?

Neither SessionTalk SIP Softphone nor Castel SIP shows ads.

### Which is updated more often, SessionTalk SIP Softphone or Castel SIP?

SessionTalk SIP Softphone ships an update every 4 days, and Castel SIP every 4 months. Most recently, SessionTalk SIP Softphone was updated on November 1, 2026 and Castel SIP on November 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*