Zultys Mobile Softphone Configuration and Troubleshooting

Zultys SIP communication ports configuration
March 27, 2019
MXIE Font Too Small
Zultys MXIE on Ultra HD Monitors – font too small
July 3, 2019
Zultys SIP communication ports configuration
March 27, 2019
MXIE Font Too Small
Zultys MXIE on Ultra HD Monitors – font too small
July 3, 2019

Zultys Mobile Softphone Configuration and Troubleshooting

MXIE Softphone Troubleshooting
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Update 09/21/2022

Starting with Zultys MX Mobile for iPhone 2.0.79 mobile app is using WebRTC instead of SIP to make and receive calls. Since iOS often requires a valid SSL/TLS certificate to allow secure communication, please configure a valid LetsEncrypt certificate on your Zultys Phone system and make sure that TCP ports 80 and 443 are open on the phone system side.

Update 10/21/2021

Starting with Zultys software release 16.0.4 and latest releases of MX Mobile , mobile softphone will automatically attempt to use TLS, TCP and alternative UDP ports if they are configured correctly on the phone system. Use this link for information on how to configure SIP ports on your phone system

iPhone users

Please confirm that you are using Zultys MX Mobile , not Zultys Mobile Communicator. Zultys Mobile Communicator is for phone systems running software version 15.0.6 and older and will not work correctly starting at software version 16.0.2.


While using Zultys Mobile application with softphone enabled you may experience following problems:
1. Unable to make or answer the call
2. Softphone is shown as “not connected”
3. No voice or one way voice.

Before following this guide, make sure Zultys phone system SIP communication ports are configured per this link

User manuals

Please refer to Zultys Mobile Communicator user manuals below for installation and configuration instructions

Zultys Mobile for Android Zultys Mobile for IPhone


Login to Zultys Mobile application and go to Settings – On Android touch the gear icon in the top right corner of the screen  – notice the red arrow on the picture below

Zultys Mobile
Zultys Mobile Interface

On IPhone tap on the More icon in the bottom right corner and select Setting

In Settings select Advanced

Zultys Mobile Settings
Zultys Mobile Settings

Under Advanced set:
1. Local SIP port: 5062
2. MX SIP port: 5061
3. Protocol: TLS

Zultys Mobile SIP TLS
Zultys Mobile Advanced Settings


Softphone is not registering

You can also see this message: “Error while registering SIP. (408 Request Time Out )

Please make sure SIP TLS communication port is configured on the Zultys Phone system per this link. Also for systems behind a firewall  that port TCP 5061 is forwarded correctly.

No one can hear me when I use Zultys Mobile with softphone enabled

On IPhone please allow Zultys mobile access to a microphone 

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