General SIP Questions: DIsabling SIP Application Layer Gateway (ALG) functionality Answer:
Disabling SIP ALG
If you are experiencing one way voice particularly on incoming calls the most probable cause is SIP ALG. While originally designed to resolve a NAT ...
Inbound Calls: Shared Line Call Appearance Answer: SHARED LINE FEATURE
The Tel2 Shared Line service enables you to have up to 6 devices or phones registered against a single Tel2 number at the ...
Outbound Calls: Outbound Trunking Answer:
Outbound Trunking
Outbound trunking is a feature that allows you to present other direct dial-in (DDI) numbers as Caller ID on your registered trunk relieving phone ...
Advanced Features: Presence and Busy Lamp Field (BLF) Answer:
Presence and Busy Lamp Field (BLF)
Click here for a more detailed guide to what BLF (Busy Lamp Field) is and some example configurations for Cisco ...
Preferences: SIP Peering Answer:
SIP Peering
SIP Peering (also called SIP Trunking) enables you to statically connect your IP-PBX public interface (WAN IP) with our public IP while we inturn limit access ...
Preferences: TCP, TLS and Secure RTP Options Answer:
TCP, TLS and Secure RTP Options
We support both TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) communication protocols. While UDP is by far the ...
Faxing Questions: vFax and T.38 Answer:
vFax and T.38
Our vFax service replaces your legacy fax machine by using our fax gateway and your email client for both the sending and receipt of faxes. ...
Cloud PBX Features: Cloud PBX Numbers Settings Answer:
Cloud PBX numbers settings
As the name suggest Line Number Select is the key admin tool for accessing individual numbers on your account. Additionally you can use ...
Account Management: Fraud Control and Management Answer:
How does Tel2 deal with Fraud?
Toll fraud is a potential threat not just for Telcos but all businesses subscribing to a VoIP phone service. While we will quickly disable any suspected ...
Technical Questions: Ports and Hostnames Answer:
Ports and Hostnames
DNS Settings
Proxy
phone.tel2.co.uk
TCP/TLS Proxy
phone.tel2.co.uk (port 5061)
SIP Peering IP Address
27.111.15.65
Other
Our RTP Port Range
30000-40000
Our T.38 (faxing) UDPTL Port Range
40000-50000
Fax
fax.tel2.co.uk
Primary NTP
uk.pool.ntp.org
SIP (UDP/TCP)
5060
SIP TLS proxy
5061 (phone.tel2.co.uk)
If using TLS verify whether ...
Technical Questions: NAT and SIP ALG Answer:
NAT
NAT Traversal
NAT can interfere with SIP and RTP by changing the ports on the way through. To counter we enable NAT traversal by default therefore ...
Technical Questions: Problems with DTMF (Pressing digits during a call) Answer:
Problems with DTMF (Pressing digits during a call)
If you are reporting that your IVR is intermittently failing when pressing the menu selections of your Auto ...
Cloud PBX Features: List of Cloud PBX Features Answer:
List of Cloud PBX Features
All Cloud PBX customers are licensed to use ALL these features (and more) regardless of which plan or bundle you select. This is ...
Technical Questions: Can I use my existing phone with Tel2? Answer:
As a SIP or VoIP service provider you will require an IP telephone handset to make calls on the Tel2 network. Commonly used handsets are those ...
Technical Questions: Can I use the Tel2 Cloud PBX if my on-premise PBX fails? Answer:
Can I use the Tel2 Cloud PBX if my on-premise PBX fails?
Yes, absolutely.
Location: CloudPBX > select number > Inbound Calls
Summary: Setting up a second layer of redundancy on ...
Technical Questions: SIP Registration, Peering and IAX2 explained Answer:
SIP Registration, Peering and IAX2 explained
Tel2 supports SIP registration, SIP peering and IAX2 registration to connect your VoIP service.
SIP Registration
The simplest of the three connection types “Registration” is used ...
Technical Questions: Why can’t I register my VoIP device? Answer:
Why can’t I register my VoIP device?
Firewalls and Interfering routers are the most common cause of SIP registration failure with your VoIP device where the firewall/router ...
Technical Questions: Bogus or Spam incoming calls Answer:
Bogus or Spam incoming calls
If you’re experiencing spam or phantom incoming calls that appear as “blocked” or CLIs such as 100 you are probably the victim ...
