To ensure optimal call quality, reliable connectivity, and trouble-free service with VentureTel's VoIP platform, it's important to configure your local network and firewall correctly. This guide outlines the required and recommended best practices for setting up your network for use with VentureTel phones, softphones, and devices.
Your network firewall or router must allow outbound access to the following ports and protocols. This enables phones and devices to register and send/receive audio through VentureTel's cloud-based VoIP infrastructure.
Note: In most setups, phones initiate the connection to the VoIP servers, creating a NAT mapping that allows return (inbound) traffic. You typically do not need to allow unsolicited inbound access unless you are manually port forwarding or using custom NAT configurations.
Protocol | Port(s) | Direction | Description |
---|---|---|---|
UDP | 5060β5080 | Outbound | SIP signaling to VentureTel |
UDP | 10000β20000 | Outbound | RTP (media/audio) |
TCP | 5061 | Outbound | Secure SIP (TLS, if used) |
TCP/UDP | 443 | Outbound | Provisioning & portal access |
UDP | 123 | Outbound | NTP (time sync, optional) |
UDP | 53 | Outbound | DNS lookups |
SIP ALG is a βfeatureβ found in many commercial and residential routers that modifies VoIP packets, often corrupting SIP signaling and causing:
Best Practice: Disable SIP ALG on all routers, firewalls, and modems.
1.1.1.1
(Cloudflare) or 8.8.8.8
(Google)EF (46)
for RTPAF31
for SIP (optional)Symptom | Likely Cause | Fix |
---|---|---|
One-way audio | RTP blocked or SIP ALG active | Disable SIP ALG, verify UDP 10000β20000 outbound |
Call drops after a few seconds | NAT timeout or firewall interference | Extend UDP session timers, disable ALG |
Phone wonβt register | SIP ports blocked, DNS issue | Open UDP 5060β5080 outbound, check DNS |
Choppy or delayed audio | Bandwidth congestion | Enable QoS for SIP/RTP traffic |
If you're unsure how to configure your network or run into issues, contact the VentureTel support team: