hi Giuseppe,

Correct but my problem is the following :

since the phone are not connected on teh same LAN and teh connectivity need to be done by the Router , how will router send the frame in the opposite direction through the same link .

Generaly the router will not send the frame back and that is what i need

BR,

Yoram

Hello Yoram,

when we look at a phone conversation in terms of IP flows we can see there are multiple IP flows with different IP addresses that are used:

signalling

(phoneA_ipaddr, server_ipaddr)

one or more actually

(phoneB_ipaddr, server_ipaddr)

one or more actually

call setup (phoneA_ipaddr,phoneB_ipaddr)

all the above are usually TCP sessions

bearer streams that carry voice

(phoneA_ipaddr,phoneB_ipaddr)

if so the router is never in the need to send back the same packet out the interface in which it is received.

packets with IP SA,DA (phoneA_ipaddr,phoneB_ipaddr) are routed directly without going via the softswitch.

if the softswitch wants to be in the middle of media streams the following happens

call leg 1:

phoneA_ipaddr, server_ipaddr

call leg2:

server_ipaddr, phone B_ipaddr

this allows the router to work well

Hope to help

Giuseppe

Hi Giuseppe ,

The thing is that the network which is connected to port 1 of the router is MPLS,and so phone A is connected to port 1 via tunnel A .

Phone B is connecte also to router port 1 via tunnel B.

due to split orizon packet or frame that goes from phone A will never go to tunnel B.

And so all the frames goes to the router that need to pass them in reverse direction through the same port 1 .

Now the frame can go through tunnel B to phone B.

So the question is how to cause the router to tranmsit the frames back

hope i explained myself

br,

yoram

Hello Yoram,

it is not clear for me.

Attach a network diagram and part of configurations of your router.

split-horizon is a concept that relates to:

routing updates

and works when a device should advertise a route out the same interface where it has learned it.

Here we are speaking of voip packets so I don't see why split horizon should play a role here.

Besides this if there are two tunnels they are two distinct layer3 interfaces so split-horizon should not apply to them.

Difficult to say more without some details.

remove sensitive information like public ip addresses and passwords

Hope to help

Giuseppe

Hi Giuseppe ,

The MPLS network is not cisco , its the facility of the customer that i need to use .that's how it works :

from all phones u have tunnels to the same point of the router.

The router should be the one who shoud switch the packet in reverse direction .

seems strange but that's how this works.

BR,

Yoram