This Tech Tip demonstrates the complete set of PCPro program settings required to configure Intermedia SIP Trunks on the NEC SL2100 phone system. It includes SIP setup, port forwarding guidelines, codec settings, and DID translation. This guide applies to the NEC SL2100 only.
Get Connected
This procedure requires access to the NEC SL2100 using the PCPro Programming Software.
⚠️ Please consult with on-site IT personnel for this section.
You will now need to forward ports in the clients Router or Firewall to allow the inbound traffic from Intermedia’s Servers.
Forward Port 6060 (UDP) to the phone system’s IP address set in 10-12-09 (this is the SIP signaling port)
Next, you will need to forward a range of ports for audio/voice.
Forward RTP/UDP Ports 10020–10083 to the IP address set in 84-26
Disable SIP ALG on all network components (modem, router, firewall, etc.)
Program 10-67: SIP Stack Configuration Setup
Setting
Value / Description
Trunk Type
SIP
Start Port
First available line port after physical CO lines
Number of Ports
Matches number of installed SIP Trunk Licenses
Example: If you have one CO-line card (3 ports), your SIP Start Port would be 4. If you have two CO-line cards (6 ports), your SIP Start Port would be 7 (Even if you are using only 4 of the 6 CO Ports, your value would still be 7).
Program 10-68: IP Trunk Availability
Item
Value
01 – DNS Mode
ON
02 – DNS IP Port
8.8.8.8
Program 10-03: VOIPDB Configuration
Physical Port
Trunk Logical Port
Trunk Type
01
1
SIP
02
2
SIP
03
3
SIP
04
4
SIP
Program 10-28: SIP System Information Setup
Item
Value
01 – Domain Name
com
02 – Host Name
uc70.accessline
03 – Transport Protocol
UDP
05 – Domain Assignment
Domain Name
Program 10-29: SIP Server Information Setup
Item
Value / Notes
01 – Outbound Default Proxy
Checked
02 – Inbound Default Proxy
Unchecked
03 – Default Proxy IP
(Provided by Intermedia)
04 – Default Proxy Port
6060
05 – Register Mode
Manual
06 – Registrar IP Address
(Provided by Intermedia)
07 – Registrar Port
6060
08 – DNS Mode
Checked
09 – DNS IP Address
8.8.8.8*
10 – DNS Port
53
11 – Registrar Domain Name
uc70.accessline.com
12 – Proxy Domain Name
com
13 – Proxy Host Name
uc70.accessline
14 – SIP Carrier Choice
Carrier N**
15 – Registration Expiry
3600
16 – Register Sub Mode
Unchecked
17 – DNS Source Port
53
20 – Authentication Trial
1
21 – NAT Router
Yes
*Use any valid domain name server such as Google’s 8.8.8.8 address in field 09.
**We have seen this value be either C or N. Start with Carrier Choice C and test. If unsuccessful, change to N and reboot the system.
Program 10-36: SIP Trunk Registration Information
Field
Value
Registration ID
00
Registration
Checked
User ID
3215551234 (main number)
Authentication User ID
(Provided by Intermedia)
Authentication Password
(Provided by Intermedia)
Program 20-08: Class of Service
Item
Value
13 – Set Calling Party Number
Checked
Program 21-17: IP Trunk (SIP) Calling Party Number Setup for Trunks
Trunk
Calling Party Number
1
2221234567
2
2221234567
3
2221234567
4
2221234567
Program 84-13: SIP Trunk Codec Information Basic Setup
