I am running a pilot before implementing basic VoIP with leased link between two location having 2621 routers.
IN the lab
- I have one 3660 and one 2621 connected back to back with ethernet interface . IOS is 10.0.5 (T)
- has FXS voice cards with one telephone on each.
- I am getting clear voice when communicating between the two FXS ports on the same router.
- But i can't hear any voice if i try to communicate across the two router's FXS ports. Although i do get the ring. There is lot of noice and disturbance
I am sure this can be fix... as there should not be problem between two routers connected back to back.
- Pl some one can suggest fine tuning of the config. (at present i hv just basic config defining the dial-peers and with pots and Voip.
Thanks in advance
thanks spike... my config is like below..
dial-peer voice 201 pots
dial-peer voice 202 pots
dial-peer voice 601 voip
session target ipv4:10.250.0.2
ip address 10.250.0.1 255.255.255.0
no ip redirects
no cdp enable
** the similar config is on ther other router.
Thanks and regards
Remove the "+" from the destination patterns it only confuses matters.
Confirm you have the same codecs configured at each end, either by re-typing them in
dial-peer voice 100 voip
codec g729ar8 (for compressed calls)or
codec g711ulaw (for uncompressed)
or verify them by doing
SHOW DIAL-PEER VOICE
It worked...! thanks..the quality is v.GOOd now.
Pl. give ur guidence for my real-life scenario -
- I hv to do VOIP between the two router (diffent locations) which passes the network wich 3 hops having one T1 link and one IPLC link. The total round trip time (ping response) is about 695ms.
- We are not expecting very high quality voice.. but aiming for reasonably good voice communication.
It would be great if you can give some TIPs and some DOs and DON'Ts.
Use a low bandwidth codec (g729ar8) for the VOIP dial-peers, then use RSVP to reserve bandwidth along the wan links. The round-trip delay shouldn't cause you too many problems, however jitter will (variance of round-trip) Are you running data over these links as well as the voice ? What are the routers and performance capabilities (ie Model no., amount of RAM etc). Remember quality of service mechanisms only need consideration if WAN Routers need to queue packets (ie WAN link congestion). Try it, and see !
make sure the codec sttings match on the voip dial peers pointing at either router. you should be straight after that. If not, we need a sample of your config
Msamuels is definetely right. if that doesn't work, you will have to show us the details about each particular voip dial peers by issuing:
show dial-p voice 601
also it will be useful if you gave us the output of the command "show dial-p voice sum" just so that we can rule certain things out.
If the call establishes after going off hook and you have bad speech quality, or just one way speech - then you are probably missing "ip routing" on one or both of the routers. You require this config even if you don't intend to use a routing protocol. If it's not there you will have variable speech quality what ever codec is used - why is this so? it's just one of those things in IOS!!!!
Good luck... Phil.C