This article outlines the basic network requirements needed for NUACOM IP phones and applications to function correctly with the cloud system.

These settings are required for phone registration, call setup, and audio delivery.
If they are not in place, the system may not function as expected.

Internet Connectivity

A stable internet connection is required for all NUACOM phone services.

Minimum requirements

• Reliable broadband or fibre connection

• Consistent connectivity without frequent dropouts

• Sufficient bandwidth for the number of simultaneous calls

Note:
General internet access (such as browsing or email) does not always indicate suitability for real-time voice traffic.

Firewall and Router Requirements

Your network firewall or router must allow NUACOM traffic to pass without restriction.

Key requirements

• Outbound connections must be permitted

• SIP ALG (Application Layer Gateway) must be disabled if present

  • SIP ALG can interfere with call setup and audio flow

ISP Modems and Firewalls

If you are using an ISP-provided modem, we recommend placing a dedicated firewall or router behind the modem (in bridge mode, where supported).

ISP modems typically provide basic routing functions but may offer limited control over:

• Correct handling of SIP traffic

• UDP session management

• Firewall and security rules

Under normal browsing conditions these limitations may not be noticeable. However, during business-related network activity, they can affect real-time voice traffic and lead to call issues.

Using a dedicated firewall or router provides greater control over network traffic and helps ensure reliable communication with the NUACOM platform.

Required Network Ports

The following ports must be allowed outbound from your network to the NUACOM platform to ensure proper system functionality.

Signalling

Used for phone registration and call setup.

• UDP / TCP 5060 – SIP (non-encrypted)
  (Hardware phones)

• TCP 5061 – SIP over TLS (encrypted), if enabled
  (Hardware phones)

• TCP 443 – TLS signalling and services
  (Hardware phones and NUACOM apps)

• UDP 19302 – STUN
  (NUACOM apps only – stun.l.google.com)

Media (Audio)

Used for real-time voice traffic.

• UDP 10000–30000 – RTP (audio streams)

DNS Configuration

Correct DNS resolution is required for phones and applications to locate NUACOM services.

• DNS queries (UDP/TCP 53) must be allowed

• Avoid blocking, intercepting, or redirecting DNS traffic

• Ensure DNS responses are not filtered or altered

NAT Compatibility

NUACOM services work with Network Address Translation (NAT), provided it is not overly restrictive.

Recommended behaviour:

• Allow outbound UDP traffic

• Avoid very short UDP session timeouts up 30 seconds, have 60 seconds.

• Permit return traffic for established sessions

IP Phones and Applications

Hardware IP Phones

• Must have direct internet access (no captive portals)

• Must not be restricted to web traffic only

• Should not require manual port forwarding

Softphones and Mobile Apps

• Must be allowed to connect via Wi-Fi or mobile data

• VPN usage may affect call connectivity depending on configuration

Common Symptoms of Missing Essential Settings

If essential network requirements are not met, you may experience:

• Phones failing to register

• Calls not connecting

• One-way or missing audio

• Calls disconnecting shortly after connecting

These issues can occur even when general internet access appears normal.