Voice Over Frame

[mmcgurty]

We are considering linking a site near us via frame to do voice over frame using the following:

2620's routers, 1 NM2V, 1 WIC2T, Enterprise Plus 12.1T, Merlin Magix PBX and Definity PBX.

I had some question for anyone who has done this.

1.) How did anyone else connect to the PBX? DS1,E&M, VoIP card?
2.) What compression did you use? 8K, 24K, or more?
3.) Problems associated? I.E. Quality of Service, router memory, router throughput, voice drops (popping/clicking)?
4.) How did you size your PVC? We are guessing we want to be able to handle 4 calls. Cisco recommends we use 24Kx4 connections which would be 96K...so a 128K PVC?
5.) Should we use 2 DLCI's? One for data, the other for voice?

Any information would be greatly appreciated.

 

[cisco8565]

Question: are you installing vofr or voip over frame?

1. Connections to the pbx are based on what you want the PBX to do. I have used FXS, E&M, and T1 interfaces. All work fine. FXS will not allow you to perform extension dialing, but E&M and T1 will (depending on security, trunk access, dialing plan on pbx).

2. Compression choices: They all work, so ...
(I am using G729 which is 8k for alot of connections).

3. Problems so far: We lose about every 500th call for some undeterminable reason. Intermittant DTMF issues in Singapore accessing voice mail system in Pennsylvania. Because both of these problems are intermittant, they are being put on the back burner for awhile, TOOOO much else going on.

4. We sized our PVC's for five calls, even though all routers are only configured for four calls. Works well.

5. 2 DLCI's are the way Cisco NOW reocmmends it. When we started it was a single DLCI recommendation and that is what we continued with. (My dept can be stubborn about this).

Thanks, Bob

 

[jeter]

here is a working config on an E&M install.

interface Serial0
description Frame Relay VOFR DLCI 70 128K DLCI 71 256K
no ip address
encapsulation frame-relay
service-module t1 timeslots 1-6
frame-relay traffic-shaping
frame-relay lmi-type ansi
!
interface Serial0.1 point-to-point
bandwidth 128
ip address 192.168.1.1 255.255.255.252
frame-relay interface-dlci 70 IETF
!
interface Serial0.2 point-to-point
bandwidth 256
ip address 192.168.1.5 255.255.255.252
frame-relay interface-dlci 71 IETF
class voice
vofr cisco
!
interface FastEthernet0
ip address 10.1.1.1 255.255.255.0
speed 100
!
router eigrp 100
network 10.0.0.0
network 192.168.1.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.2
no ip http server
!
!
map-class frame-relay voice
frame-relay cir 256000
frame-relay bc 2560
frame-relay mincir 64000
no frame-relay adaptive-shaping
frame-relay fair-queue
frame-relay voice bandwidth 48000
frame-relay fragment 360
!
voice-port 1/0
operation 4-wire
type 2
!
voice-port 1/1
operation 4-wire
type 2
!
voice-port 2/0
operation 4-wire
type 2
!
voice-port 2/1
operation 4-wire
type 2
!
dial-peer voice 1 pots
destination-pattern ..........
port 1/0
!
dial-peer voice 2 pots
destination-pattern ..........
port 1/1
!
dial-peer voice 3 pots
destination-pattern ..........
port 2/0
!
dial-peer voice 4 pots
destination-pattern ..........
port 2/1
!
dial-peer voice 5 vofr
destination-pattern .
session target Serial0 71
dtmf-relay
no vad
Jeter@LasVegas.com
Fisher CCNA
Sprint-Data