I have configured cRTP on a PPP (in fact, Multilink PPP) link. I noticed that, when the command"ip rtp header-compression"is issued, the command"ip tcp header-compression"is automatically added by the router.What makes me worry is that, as this link ...

I have the following topology:Telephone "A"<->PBX<->1750(FXO)<->5350(ISDN)<->PSTN<->Telephone "B"When "A" calls "B" and "B" answers, after both sides hanging up, the channel between the PBX and the 1750 *never* gets disconnected (I waited for more th...

I have a problem with echo not being cancelled during double talk. When the two parties talk together, echo becomes very annoying. But echo is perceived only by one of the users, let's call him "A". "A" is connected to a 1750 (through a PBX) and "B" ...

After I place a call from an FXO port (connected to the PBX), the port never more disconnect, even with both sides on-hook. The call originates on the FXO port, coming from the PBX. The FXO port is in a 1750 with 12.2(8)T.The other side is an E1 gate...

This is a little long, but I tried to make it as clear as possible.I have found a strange behaviour in my VoIP network. Look at these two setups:KS <-> PBX <-> 1750 <-> 5300 <-> PSTN <-> PBX <-> telandtel <-> PBX <-> 1750 <-> 5300 <-> PSTN <-> PBX <-...