FXS to FXO

moamen.elhefnawy · ‎09-21-2007

Hello All ,

need urgent help please , I have a router with FXS 4 - ports , and we connected them to PBX ( FXO port) , the problem that :

When we place a cll from the network to any ext behind the PBX , all the FXS ports on the router go off-hook , and some times all are off -hook even with out calls

#sh voice port summary

IN OUT

PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC

============== == ============ ===== ==== ======== ======== ==

0/1/0 -- fxs-gs up up off-hook idle y

0/1/1 -- fxs-gs up up off-hook idle y

0/1/2 -- fxs-gs up up off-hook idle y

0/1/3 -- fxs-gs up up off-hook idle y

we tried to change the signaling to Loop start but with no joy

Do you have any suggestions

Thanks

Moamen

vmoopeung · ‎09-27-2007

The end-to-end connection between the CO RJ11 jack and the router voice-port must be a straight-through connection. This means that TIP goes to TIP and RING to RING. Normally the CO provides an interface for which a standard rolled RJ11 cable can be used since the connection that results is straight. However, sometimes the CO cannot reverse the pinouts and therefore, a straight RJ11 cable is needed.

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080094fac.shtml

http://www.cisco.com/en/US/tech/tk1077/technologies_configuration_example09186a008009431b.shtml