atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems IP Remote PIM Question

Got a question for ya'll. If I have a 2000IPS with a Remote PIM (an actual Remote PIM not a Pizza Box), and I have TDM Dterms hanging off of it. My question is if you make a station to station call in the Remote Site, does the call get sent through the IPLA, get translated into IP, and then sent back to the Main Site, to be translated and resent back to the Remote Site? or is the Remote Site CP smart enough (from the download) and active enough (being in standby mode) to realize that both phones are assigned in 19XXX and just connect without sending the call to the Main Site and chewing up bandwidth?

TDM calls made internally do not use the Pad card until they need to leave the Pim. Watch your pad card & place a internal call & you will see the Pad Card remain idle. Hope this helps.

Right. If you're calling TDM to TDM, the call never touches the PAD.

If you call IP phone to IP Phone, the first IP phone sends one TCP packet to the processor, to set up the call, then the rest is UDP packets from phone to phone (and the call will stay up even if the PBX goes down). It takes another TCP to drop the call.

Only when an IP device talks to a TDM device does the IPLA card get into the act.

there also a feature called "Link Reconnect" which will simplify links if someone bounces a call back and forth across the IP link.

If you're having bandwidth issues (and that's why you're asking) check your compression settings. I recommend G.729 compression. Also, make sure that your TOS is set to 5 or 6 for your packets.

Cisco routers honor TOS by default.