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Have some voice problem and need some advice

I have some problem at my voice network. I connect two 1750 with FXO and FXS at 64K Lease line. But there is some voice delay, echo and can¡¦t dial to branch side usually. I had done some QoS on it. Anyone can give me some advice? I attach the router config for reference.

Head Office router: (4 voice FXO interfaces)

================================

Building configuration...

Current configuration:

!

version 12.1

!

!

class-map voice

match access-group 100

!

!

policy-map llq

class voice

priority 45

!

memory-size iomem 25

ip subnet-zero

no ip finger

no ip domain-lookup

!

!

!

!

voice-port 1/0

input gain 6

output attenuation 12

echo-cancel coverage 32

connection plar 8601

description connected to PABX no.082

!

voice-port 1/1

input gain 6

output attenuation 12

echo-cancel coverage 32

connection plar 8602

description connected to PABX no.084

!

voice-port 2/0

input gain 6

output attenuation 12

echo-cancel coverage 32

connection plar 8603

description connected to PABX no.081

!

voice-port 2/1

input gain 6

output attenuation 12

echo-cancel coverage 32

connection plar 8604

description connected to PABX no.035

!

!

dial-peer voice 85201 pots

destination-pattern 85201

port 1/0

!

dial-peer voice 85202 pots

destination-pattern 85202

port 1/1

!

dial-peer voice 85203 pots

destination-pattern 85203

port 2/0

!

dial-peer voice 85204 pots

destination-pattern 85204

port 2/1

!

dial-peer voice 8601 voip

destination-pattern 8601

ip precedence 5

session target ipv4:210.254.255.2

!

dial-peer voice 8602 voip

destination-pattern 8602

ip precedence 5

session target ipv4:210.254.255.2

!

dial-peer voice 8603 voip

destination-pattern 8603

ip precedence 5

session target ipv4:210.254.255.2

!

dial-peer voice 8604 voip

destination-pattern 8604

ip precedence 5

session target ipv4:210.254.255.2

!

!

interface Tunnel0

bandwidth 64

ip address 192.168.254.1 255.255.255.252

tunnel source 210.255.10.2

tunnel destination 210.254.255.2

!

interface Serial0

mtu 300

bandwidth 64

no ip address

encapsulation frame-relay

no ip mroute-cache

service-policy output llq

frame-relay lmi-type ansi

frame-relay ip tcp header-compression

frame-relay ip rtp header-compression

!

interface Serial0.133 point-to-point

bandwidth 64

ip address 210.255.10.2 255.255.255.252

no ip mroute-cache

service-policy output llq

frame-relay interface-dlci 133

frame-relay ip tcp header-compression

frame-relay ip rtp header-compression

!

interface FastEthernet0

ip address 192.168.1.253 255.255.255.0

speed 10

half-duplex

!

ip classless

ip route 210.254.0.0 255.255.255.0 Tunnel0

ip route 210.254.255.2 255.255.255.255 Serial0.133

ip route 192.168.19.0 255.255.255.0 Serial0.133

ip route 211.159.29.17 255.255.255.255 Serial0.133

no ip http server

!

!

no scheduler allocate

end

Branch Office router (4 voice FXS interfaces):

=================================

Building configuration...

Current configuration:

!

version 12.1

!

!

!

!

!

memory-size iomem 15

ip subnet-zero

!

!

!

!

voice-port 1/0

input gain 4

output attenuation 6

echo-cancel coverage 32

description connected to ext.007

!

voice-port 1/1

input gain 4

output attenuation 6

echo-cancel coverage 32

description connected to ext.008

!

voice-port 2/0

input gain 4

output attenuation 6

echo-cancel coverage 32

description connected to ext.005

!

voice-port 2/1

input gain 4

output attenuation 6

echo-cancel coverage 32

description connected to ext.006

!

!

dial-peer voice 8601 pots

destination-pattern 8601

port 1/0

!

dial-peer voice 8602 pots

destination-pattern 8602

port 1/1

!

dial-peer voice 8603 pots

destination-pattern 8603

port 2/0

!

dial-peer voice 8604 pots

destination-pattern 8604

port 2/1

!

dial-peer voice 85201 voip

destination-pattern 85201

ip precedence 5

session target ipv4:210.255.10.2

!

dial-peer voice 85202 voip

destination-pattern 85202

ip precedence 5

session target ipv4:210.255.10.2

!

dial-peer voice 85203 voip

destination-pattern 85203

ip precedence 5

session target ipv4:210.255.10.2

!

dial-peer voice 85204 voip

destination-pattern 85204

ip precedence 5

session target ipv4:210.255.10.2

!

!

interface Tunnel0

bandwidth 64

ip address 192.168.254.2 255.255.255.252

tunnel source 210.254.255.2

tunnel destination 210.255.10.2

!

interface Serial0

mtu 300

ip address 210.254.255.2 255.255.255.252

ip tcp header-compression

no ip mroute-cache

traffic-shape rate 64000 1000 0 1000

ip rtp header-compression

ip rtp priority 16384 16383 45

!

interface FastEthernet0

ip address 210.254.0.1 255.255.255.0

speed auto

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.254.255.1

ip route 210.254.0.0 255.255.255.0 Null0

ip route 192.168.1.0 255.255.255.0 Tunnel0

no ip http server

!

!

end

3 REPLIES
Cisco Employee

Re: Have some voice problem and need some advice

New Member

Re: Have some voice problem and need some advice

FRF 12 support 2600 or 3600 series. How about this case which is 1750?

New Member

Re: Have some voice problem and need some advice

Try taking off header compression and also check what codec you are using. if you are using G711 on a 64k line then that would add some delay as it uses around 88k, try using G729a.

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