In order to allow two or more SIP terminals (VoIP phones or devices) on a network to operate reliably behind one router, please ensure each SIP terminal uses different Local Ports.
Most VoIP phones and devices will be pre-configured to use the following ports:
- Listen SIP Port: 5060
- Listen RTP Port: 5004
Instead please set your first VoIP phone to use:
- Listen SIP Port: 44160
- Listen RTP Port: 44104
For the next VoIP phone please use:
- Listen SIP Port: 44260
- Listen RTP Port: 44204
For additional VoIP phones or devices, continue increasing the ports so that each additional phone uses a successive SIP port like: 44160, 44260, 44360, 44460, etc (and the same for the starting RTP port: 44104, 44204, 44304, 44404, etc).
Each 'EXT' or 'Line' under 'SIP Settings' has a 'SIP Port' setting.
The RTP ports will be found under 'Voice' --> 'SIP' --> 'RTP Parameters'.
Open 'Configuration' --> Network --> Local Port.
The RTP port used by PhonerLite will be set to two ports higher than the chosen Local (SIP) Port.
Open 'Settings' --> 'Preferences' --> 'Advanced' --> 'Network'.
Under 'SIP Options' the Local SIP Port can be changed and the starting RTP port can be chosen under 'RTP Options'.
Please disable the options to use Random Ports.
Zoiper (Apple iOS):
Click on 'Settings' --> 'Advanced' to change Zoiper's Local SIP and RTP Port settings.
You'll find the Local SIP and Starting Local RTP Port settings under 'Config' --> 'Connectivity' --> 'Listening Ports'.
From the Menu below the Dialpad select 'Settings' --> 'Network' to change CSIP local ports.
The Local SIP Port is called the 'UDP Port - port number to bind locally'.
With the Expert set up Wizard selected, each VoIP account can also be allocated a different "Port for RTP ports range start".
Bria (Apple iOS):
From the Dialpad click 'Settings' --> 'Advanced Settings'.
Under 'Media Options' the SIP Port Range and 'RTP Port Range for Audio' can be chosen.
The Start and End SIP Ports should be the same value (don't use a range of SIP ports).
The Local SIP port used by Bria for Android can't be changed.
The Starting RTP port Bria uses can be changed under Settings --> Advanced Settings.
Bria Desktop and X-Lite:
Open Your sipgate account Settings and click on the 'Topology' tab to change the softphone's Local SIP ("Signalling") port and RTP ports.
Each Line can be allocated a different Local SIP Port ("SIP Source Port") under "VoIP" --> "SIP Settings" --> 'Line x'.
The RTP port settings will be found in the "VoIP Settings" menu.