hi

thank you for your post

do you have any sample configuration?

See for example:

http://cisco.com/en/US/tech/tk652/tk653/technologies_configuration_example09186a00800fa11a.shtml

It's for T1 but E1 is not different.

Hope this helps, please rate post if it does!

Two additional points, that might be worth noting.

When you share digital voice with data on the same link, QoS often should be configured to insure the digital voice obtains the level of performance it requires.

Depending on the voice codec, it could use more bandwidth then your existing analog voice signal. (I.e. an E1 might not be able to carry as many voice calls.) I recall Cisco recommends not using more than a third of the path's bandwidth for voice. (This I believe so QoS will have the sufficient bandwidth to guarantee the necessary performance.)

thank you for your follow up

but in your example the link between two routers is ethernet , but in my case its E1

It makes no difference. VoIP works over any media whee IP works.

The only thing to note when the media is Ethernet is the overhead..

A g729 call on a traditional serial link would take about 24 kbps whereas the same call on Ethernet would take 32kbps. This might need to be looked upon when sizing the bandwidth

Narayan

"but in your example the link between two routers is ethernet , but in my case its E1 "

Although Narayan mentions Ethernet, there's the additional overhead of IP and the overhead of L2 encapsulation (e.g. HDLC), also on your E1. Narayan also mentions using a compressed codec, but an uncompressed codec like the g711 starts at 64 K before adding L2/L3 encapsulation.