Document Name IPECS and IPLDK20 – SIP lines are ringing with strange CLI and no-one on the line Author  Simon Colley Publish Date 28/03/2014 Version 1.1 Reference  8127470

 

1. Version Information 

 

Date Author  Update Information Version 28/03/2014 Simon Colley 1st Draft 1.0 29/01/2018 Mark Jones 2nd Draft  1.1        
 
 

2. Document Purpose & History

 

This document is intended to provide the reader with a solution for  issue of IPECS and IPLDK20 – SIP lines are ringing with strange CLI and no-one on the line

 

 

 IPECS and IPLDK20 – SIP lines are ringing with strange CLI and no-one on the line

 

 

IPECS and IPLDK20 – SIP lines are ringing with strange CLI and no-one on the line

This problem can occur where an invite is received by the system on UDP 5060 from an unknown source. The system tries to setup a call and gets as far as ringing.

Often, staff come into an office and hear phones ringing with strange CLI on handset screens.

 

Resolution

IPLDK 20

Ensure the router will only forward requests on 5060 from the source IP address of the SIP provider, this will ensure the router discards requests from any other source. This setting is available on most business class routers in the NAT setup section. This type of port forward is recommended in all instances for added security.

 

IPECS

PGM 133 – for all VoIP channels – set Invite Acceptance to “From Domain Only”. This will then discard invites from all other sources.

Ensure the router will only forward requests on 5060 from the source IP address of the SIP provider, this will ensure the router discards requests from any other source. This setting is available on most business class routers in the NAT setup section. This type of port forward is recommended in all instances for added security.

For iPECS we recommend you have a look at our security document and ensure your systems are locked down and secure in all cases.

 

 

 

 

 

 

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