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The simplest deployment option for your pascom phone system is to use which is free for all pascom customers.

Choose the phone system option and benefit from a hosted PBX without requiring any in-house or rented hosting as we take care of the hosting for you - free of charge. You can get started within minutes without any installation hassle or any additional hardware being required.

Modify Your Firewall

Many companies have no Internet access restrictions and can therefore immediately start using without needing to make any alterations to their Firewall.

Destination Ports

However, should you choose to, you can specify which internet services your company network is permitted to access by opening the following ports:

Telephony and Instant Messaging

Port Description
TCP 5061 SIP-TLS - secure SIP communication
TCP 5222 pascom desktop and mobile client access
UDP 30000 - 35000 SRTP - encrypted Voice Data
UDP 3478 Access for video functionality
UDP + TCP 19302 WebRTC

Optional Servicees

Port Description
TCP 636 LDAPS for telephone book access via LDAP
TCP 8884 Provisioning of desktop IP phones (hardware telephones)
TCP 8885 VPN tunnel direct to the phone system

QoS settings marks voice and signal packets. Many routers / switches take this into account as standard or can be configured accordingly.

Package type TOS COS DSCP decimal
Voice ef / 184 5 46
Signaling cs3 / 96 3 24

All pascom clients also mark packages accordingly. Please note that group policies must be set for this under Windows. See Windows QoS Settings.

Destination IP addresses

Our recommendation is to restrict only destination ports and not destination IP addresses. uses a variety of services and balancers and thus also corresponds to many destination IP addresses. The list of destination IP addresses is constantly being expanded and is therefore difficult for you to maintain.

If you still need a current list of destination IP addresses, please contact our support.