Kamailio SIP Server vs. OpenPhone

Overview
ProductRatingMost Used ByProduct SummaryStarting Price
Kamailio SIP Server
Score 9.0 out of 10
N/A
The Kamailio SIP Server, formerly known as OpenSER or SER, is an open source VoIP and communications platform.N/A
OpenPhone
Score 9.2 out of 10
N/A
OpenPhone, a business phone service from the company of the same name in San Francisco, adds work phone numbers to existing devices. No new hardware required; all that's required is an app. Extended services include a lightweight contact management CRM, and customer service team management (e.g. shared inbox) features.
$15
per month per user
Pricing
Kamailio SIP ServerOpenPhone
Editions & Modules
No answers on this topic
Starter
$15
per month per user
Business
$23
per month per user
Enterprise
Custom Pricing
Offerings
Pricing Offerings
Kamailio SIP ServerOpenPhone
Free Trial
NoYes
Free/Freemium Version
NoNo
Premium Consulting/Integration Services
NoNo
Entry-level Setup FeeNo setup feeNo setup fee
Additional DetailsDiscounts available for annual pricing.
More Pricing Information
Community Pulse
Kamailio SIP ServerOpenPhone
Top Pros

No answers on this topic

Top Cons

No answers on this topic

Features
Kamailio SIP ServerOpenPhone
Cloud PBX
Comparison of Cloud PBX features of Product A and Product B
Kamailio SIP Server
8.0
1 Ratings
2% below category average
OpenPhone
9.2
3 Ratings
12% above category average
Hosted PBX8.01 Ratings9.52 Ratings
Multi-level Interactive Voice Response (IVR)9.01 Ratings9.63 Ratings
User templates7.01 Ratings7.32 Ratings
Call reports8.01 Ratings9.52 Ratings
Directory of employee names8.01 Ratings10.02 Ratings
Call Management
Comparison of Call Management features of Product A and Product B
Kamailio SIP Server
8.4
1 Ratings
0% below category average
OpenPhone
9.1
7 Ratings
8% above category average
Answering rules9.01 Ratings8.34 Ratings
Call recording8.01 Ratings10.06 Ratings
Call park9.01 Ratings8.33 Ratings
Call screening8.01 Ratings9.85 Ratings
Message alerts8.01 Ratings9.15 Ratings
VoIP system collaboration
Comparison of VoIP system collaboration features of Product A and Product B
Kamailio SIP Server
7.5
1 Ratings
10% below category average
OpenPhone
9.8
8 Ratings
17% above category average
Video conferencing7.01 Ratings00 Ratings
Audio conferencing8.01 Ratings9.63 Ratings
Video screen sharing7.01 Ratings00 Ratings
Instant messaging8.01 Ratings10.08 Ratings
Mobile apps
Comparison of Mobile apps features of Product A and Product B
Kamailio SIP Server
-
Ratings
OpenPhone
9.5
8 Ratings
13% above category average
Mobile app for iOS00 Ratings9.58 Ratings
Mobile app for Android00 Ratings9.43 Ratings
Best Alternatives
Kamailio SIP ServerOpenPhone
Small Businesses
CloudTalk
CloudTalk
Score 9.5 out of 10
CloudTalk
CloudTalk
Score 9.5 out of 10
Medium-sized Companies
CloudTalk
CloudTalk
Score 9.5 out of 10
CloudTalk
CloudTalk
Score 9.5 out of 10
Enterprises
Cisco Business Edition 7000 (discontinued)
Cisco Business Edition 7000 (discontinued)
Score 9.0 out of 10
Cisco Business Edition 7000 (discontinued)
Cisco Business Edition 7000 (discontinued)
Score 9.0 out of 10
All AlternativesView all alternativesView all alternatives
User Ratings
Kamailio SIP ServerOpenPhone
Likelihood to Recommend
9.0
(1 ratings)
9.3
(8 ratings)
User Testimonials
Kamailio SIP ServerOpenPhone
Likelihood to Recommend
Open Source
Kamailio SIP Server is very well suited if you want to secure your main servers; it can perfectly act as a proxy server and a gateway to your main server. It also does load balancing and call transfers easily based on the configurations done.
Read full review
OpenPhone
If you have more than 2 people in your organization, then this will save you so much time. Delegation is the key to starting a business. Even when you're a 1 person show, being able to present to your user base the differentiation of options for client communications is critical. As a founder, feeling compelled to be always on is something I strive not to be. OpenPhone gives you that flexibility. I have found it to be less appropriate in complex HIPPA compliant areas, but that is it. OpenPhone really does seem to suit an open array of use cases.
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Pros
Open Source
  • Proxy server.
  • Security Firewall.
  • SIP to PSTN gateway.
Read full review
OpenPhone
  • It's great for texting.
  • It's great for making phone calls. You get a new, unique phone number and can text/call from phone or desktop.
  • UI is great and really intuitive.
Read full review
Cons
Open Source
  • Interportability
  • SIP conversions.
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OpenPhone
  • Call quality can be spotty on wifi if the connection is poor, but nothing they personally can do about that. 4G LTE is usually stronger and more stable.
  • N/A honestly excellent product for the price.
Read full review
Alternatives Considered
Open Source
As Kamailio SIP Server is an open source, the major impact is on cost; it's free to use compared to any other Softswitch or server in the market. You can also customize it to your need and use the features that you need, which is one of the major plus points for the Kamailio SIP Server. And one server is enough to handle thousands of calls simultaneously.
Read full review
OpenPhone
OpenPhone has an easier user interface than Grasshopper. Years ago when I was using Grasshopper, I recall that their user interface looked antiquated and full of complications. They would also update the interface just as everyone was getting used to using it. OpenPhone has many more functions. Grasshopper's app did not offer basic functions such as in-app texting between team members, and its call transfer function was incredibly complicated to use. In my opinion, Grasshopper was an inferior service/product in almost every way.
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Return on Investment
Open Source
  • As its open source ROI is excellent.
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OpenPhone
  • Provided us with a simple, yet robust phone system for our small business
  • Price can be lower for premium, and for multiple users
Read full review
ScreenShots