This document describe on resolving the issue where in the FXO port gets seized, but calls were not maturing
1. Call Flow:
The calls coming into the gateway from SIP side (sip server/phone) where in it will seize the respective FXO port (based on the dial plan) connected towards PSTN line.
2. Symptoms of the issue:
Check if you face below symptoms after the call seizes the FXO port.
- You get a dial tone after dialling the numbers
- The telco provider gives you the message as number dialled is incorrect.
Find below the basic log of a call from SIP to FXO POTS where FXO port 1 has got seized.
LOG: 03/10/2016 07:50:33.232 ROUTER (I)R0bC00 FINDROUTE profile:23(To_FXO) plan:1
call ref=[f10a00da] <-- SIP [2,1] dest=NAME:0527781178,TEL:0527781178
--> POTS [1,1] dest=TEL:0527781178
LOG: 03/10/2016 07:50:33.235 ROUTER (I)R0bC00 call proceeding
LOG: 03/10/2016 07:50:36.300 POTS (I)R03Cb6 connect call
LOG: 03/10/2016 07:50:36.330 SIP (I)R03C27 connect g711Ulaw64k (Profile 1 - Voice)
Make sure you have the latest firmware on the Vega 50
Please make sure the line detection type has set properly based on your telco provider
There are 3 ways in detecting the line, which are as follows
1) Tone detection
2) Polarity reversal detection
3) Loop current detection
Also ensure that below parameter are also set
- Enable the Full Scale value for the POTS FXO Port Hardware Profile
- Adjust the Digital Tx gain to -3
Once the above parameters are set as per your network requirement, make sure you have applied the same configuration by doing Apply and save the config