Call from PSTN through router FXO to FXS can't disconnect

[zhangqunli]

Phone_A---PSTN---FXO-Router_A----IP NETWORK-----Router_B-FXS---Phone_B

Now I use Phone A to call phone B,making by PLAR.If there is nobody beside phone B,I hook off phone A,but Phone B continue to ring,how should i do?

thx indeed!

[sgelli]

You are very likely running into an FXO disconnect problem. Take a look at the following URL:

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml

Other URLs that might be helpful are:

http://www.cisco.com/en/US/products/sw/iosswrel/ps5013/products_feature_guide09186a0080080e48.html

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a00801601ac.html

[edavila]

You can have two issues involved.

FXO Supervision is implemented with different aproach either as an IOS feature or Battery reversal.

I prefer to use VIC-2FXO-M1 (USA) which incorporates battery reversal, just make shure you have it enabled on your voice-port.

Also check for a newer 12.3(4)T for your gateway so and try some or all of this commnand at your FXO ports too.

supervisory disconnect dualtone pre-connect

supervisory answer dualtone sensitivity high

battery-reversal answer