Avaya Spaces vs Kamailio SIP Server comparison

The compared Avaya and Kamailio solutions aren't in the same category. Avaya is ranked #14 in ESS , with an average rating of 7.5, and holds a 2.0% mindshare in the category. Kamailio is ranked #5 in UC , and holds a 5.9% mindshare. Additionally, 50% of Avaya users are willing to recommend the solution, compared to 100% of Kamailio users who would recommend it.

Avaya Spaces

Read 3 Avaya Spaces reviews

492 Views
374 Comparison Views

50% willing to recommend

Kamailio SIP Server

Read 1 Kamailio SIP Server review

516 Views
470 Comparison Views

100% willing to recommend

Avaya Spaces

Kamailio SIP Server

Comparison Buyer's Guide

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Executive Summary

We performed a comparison between Avaya Spaces and Kamailio SIP Server based on real PeerSpot user reviews.

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March 2026

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Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

Avaya Spaces

Average Rating

7.6

Reviews Sentiment

7.4

Number of Reviews

Ranking in other categories

Enterprise Social Software (14th)

Kamailio SIP Server

Average Rating

10.0

Number of Reviews

Ranking in other categories

Unified Communications (5th)

Mindshare comparison

Avaya Spaces and Kamailio SIP Server aren’t in the same category and serve different purposes. Avaya Spaces is designed for Enterprise Social Software and holds a mindshare of 2.0%, up 0.7% compared to last year.
Kamailio SIP Server, on the other hand, focuses on Unified Communications, holds 5.9% mindshare, down 10.1% since last year.

Enterprise Social Software Mindshare Distribution
Product	Mindshare (%)
Avaya Spaces	2.0%
Slack Business - Enterprise	10.0%
Microsoft Teams	7.3%
Other	80.7%

Enterprise Social Software

Unified Communications Mindshare Distribution
Product	Mindshare (%)
Kamailio SIP Server	5.9%
Cisco Unified Communications	9.5%
3CX Live Chat	7.3%
Other	77.3%

Unified Communications

Featured Reviews

Tiger Mak

Channel Director at a comms service provider with 11-50 employees

Video meetings and presentation sharing impress but user-friendliness and pricing need attention

I don't have experience with how Avaya Spaces handles integration with other software tools, but perhaps my partners have experience regarding integration with different vendors. If Avaya can integrate Spaces with other media solutions, such as WhatsApp or WeChat, it will be more friendly and useful for customers or partners.

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it_user183567

PHP Dev & Telecoms Engineer at a marketing services firm with 51-200 employees

The server itself does load balancing however building a fail-over for it is difficult

The server itself does load balancing however the most difficult thing I found was building a fail-over for it. However, if you want to build a fail-over for it that's the tricky part since most sip traffic is routed using UDP. There are plenty of amazing TCP load balancers out there such as HAProxy but none for UDP. You need to use something like Keepalive and fail-over IP and restart the server on fail-over

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Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"Stability for Avaya Spaces is quite good, and I would rate it a 9."

"We use the solution for document sharing, video conferencing, instant messaging, and file sharing."

"The microphone's noise cancellation and static feature that record a human's voice are some of the most valuable features."

"This product can scale insanely, the fact that it can handle hundreds of thousands of subscribers is great and means you won't have to worry about scalability for a very long time."

Cons

"The audio calling service needs to improve its quality."

"There were some additional features coming up, as they informed us through email. But we didn't get any update on them."

"The initial setup for Avaya Spaces is very good for me, but for sharing with other users, the setup is a little bit complex compared to other solutions I have used, such as Zoom or Teams, as the installation is more complex."

"Would be nice to have more sample config files for different kinds of scenarios rather then just one default config file."

Pricing and Cost Advice

"The license grants you a subscription and costs about $120. I am not aware of additional costs."

Information not available

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Questions from the Community

What needs improvement with Avaya Spaces?

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What is your primary use case for Avaya Spaces?

Most of the time, I use Avaya Spaces to hold meetings with Avaya and with partners, which fulfills our collaboration needs.

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What advice do you have for others considering Avaya Spaces?

I can share my opinion about Avaya Spaces and recommend it for small or medium company users, as most of them are small users. I am currently working with Azure for our cloud needs. Overall, I woul...

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Comparisons

Microsoft Teams vs Avaya Spaces

Compared 41% of the time

Slack Business - Enterprise vs Avaya Spaces

Compared 29% of the time

Fortinet FortiVoice vs Avaya Spaces

Compared 29% of the time

More Avaya Spaces Competitors

Alcatel-Lucent Rainbow vs Kamailio SIP Server

Compared 34% of the time

Digium Asterisk vs Kamailio SIP Server

Compared 20% of the time

3CX Live Chat vs Kamailio SIP Server

Compared 20% of the time

Oracle Communications Unified Communications vs Kamailio SIP Server

Compared 14% of the time

Cisco Unified Communications vs Kamailio SIP Server

Compared 12% of the time

More Kamailio SIP Server Competitors

Product Reports

Buyer's Guide

Enterprise Social Software

March 2026

Download Avaya Spaces product report

Buyer's Guide

Unified Communications

March 2026

Download Kamailio SIP Server product report

Also Known As

Avaya Cloud Application Link

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Overview

The nature of work is ever changing. Right now, it’s more fast-paced, less predictable. Avaya Spaces is how to handle your usual tasks, but also the unplanned and new-priority work that arrives nearly every day. Work from anywhere and still show up.

Avaya

Kamailio is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Kamailio can be used to build large platforms for VoIP and realtime communications Ð presence, WebRTC, Instant messaging and other applications. It can also easily be applied to scaling up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk, FreeSWITCH or SEMS.

Kamailio

Sample Customers

Stop Soldier Suicide, British Columbia Ski Resort, Helse Vest, Spital Limmattal, Conduit Global

Asipto, Crocodile RCS Ltd, Edvina AB, Evariste Systems LLC, OpenXg Inc., Sipwise GmbH, VoIP Embedded

Buyer's Guide

Enterprise Social Software

March 2026

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We monitor all Enterprise Social Software reviews to prevent fraudulent reviews and keep review quality high. We do not post reviews by company employees or direct competitors. We validate each review for authenticity via cross-reference with LinkedIn, and personal follow-up with the reviewer when necessary.