Making a VoIP call with the Cisco 837 ADSL router

[mjahealy]

I would greatly appreciate if could please provide some technical assistance to my questions below:

Is it possible to make a VoIP call between two 837 ADSL Cisco routers over a 1Mbps ADSL broadband connection?

If so, can I configure this VoIP connection using either a PPPoE or ATM WAN link?

Is it possible to make a VoIP call using a Cisco 837 Router while simultaneously surfing the Internet? In other words do I need two public IP addresses i.e. one for accessing the internet and one for making the VoIP call or is one static IP address obtained from my ISP sufficent.

It is possible to configure QoS parameters (e.g. RSVP, Voice precedence, Voice codec selection) on this 837 router using PPoE or can it only be done using an ATM WAN interface?

Does the Cisco 837 router support both the H.323 and SIP communication protocols? Do I need to purchase a certain IOS operating system version for VoIP calling?

Does the VoIP dial peers need to be configured with both a POTS and VoIP phone numbers or is only one number required?

Do I need to obtain a special VoIP number from my VoIP service provider? or can I use existing POTS numbers or made up numbers within the dial peers as this situation involves making a private VoIP call between two branch offices using 837 ADSL routers and not via a VoIP service provider.

Finally, can I use POTS ordinary telephones with the Cisco 837 for making VoIP calls or do I strictly need to purchase VoIP phones?

My apologies for the number of questions asked here but I currently need to know the technical ability of the Cisco ADSL 837 as I am thinking of employing these routers in my company organisation.

I await your feedback in due course.

Thanks,

Martin Healy

[MichaelJSchulz]

Hi,

here is a sample config

class-map voice

match access-group 101

!

policy-map mypolicy

class voice

priority 128

class class-default

fair-queue 16

!

ip subnet-zero

!

gateway

!

interface Ethernet0

ip address 20.20.20.20 255.255.255.0

no ip directed-broadcast (default)

ip route-cache policy

ip policy route-map data

!

interface ATM0

ip address 10.10.10.20 255.255.255.0

no ip directed-broadcast (default)

no atm ilmi-keepalive (default)

pvc 1/40

service-policy output mypolicy

protocol ip 10.10.10.36 broadcast

vbr-nrt 640 600 4

! 640 is the maximum upstream rate of ADSL

encapsulation aal5snap

!

bundle-enable

h323-gateway voip interface

h323-gateway voip id gk-twister ipaddr 172.17.1.1 1719

h323-gateway voip h323-id gw-820

h323-gateway voip tech-prefix 1#

!

router eigrp 100

network 10.0.0.0

network 20.0.0.0

!

ip classless (default)

no ip http server

!

access-list 101 permit ip any any precedence critical

route-map data permit 10

set ip precedence routine

!

!

line con 0

exec-timeout 0 0

transport input none

stopbits 1

line vty 0 4

login

!

!

voice-port 1

local-alerting

timeouts call-disconnect 0

!

voice-port 2

local-alerting

timeouts call-disconnect 0

!

voice-port 3

local-alerting

timeouts call-disconnect 0

!

voice-port 4

local-alerting

timeouts call-disconnect 0

!

dial-peer voice 10 voip

destination-pattern ........

ip precedence 5

session target ras

!

dial-peer voice 1 pots

destination-pattern 5258111

port 1

!

dial-peer voice 2 pots

destination-pattern 5258222

port 2

!

dial-peer voice 3 pots

destination-pattern 5258333

port 3

!

dial-peer voice 4 pots

destination-pattern 5258444

port 4

!

end

[MichaelJSchulz]

Hi,

I give you a sample config of my router.

class-map voice

match access-group 101

!

policy-map mypolicy

class voice

priority 128

class class-default

fair-queue 16

!

ip subnet-zero

!

gateway

!

interface Ethernet0

ip address 20.20.20.20 255.255.255.0

no ip directed-broadcast (default)

ip route-cache policy

ip policy route-map data

!

interface ATM0

ip address 10.10.10.20 255.255.255.0

no ip directed-broadcast (default)

no atm ilmi-keepalive (default)

pvc 1/40

service-policy output mypolicy

protocol ip 10.10.10.36 broadcast

vbr-nrt 640 600 4

! 640 is the maximum upstream rate of ADSL

encapsulation aal5snap

!

bundle-enable

h323-gateway voip interface

h323-gateway voip id gk-twister ipaddr 172.17.1.1 1719

h323-gateway voip h323-id gw-820

h323-gateway voip tech-prefix 1#

!

router eigrp 100

network 10.0.0.0

network 20.0.0.0

!

ip classless (default)

no ip http server

!

access-list 101 permit ip any any precedence critical

route-map data permit 10

set ip precedence routine

!

!

line con 0

exec-timeout 0 0

transport input none

stopbits 1

line vty 0 4

login

!

!

voice-port 1

local-alerting

timeouts call-disconnect 0

!

voice-port 2

local-alerting

timeouts call-disconnect 0

!

voice-port 3

local-alerting

timeouts call-disconnect 0

!

voice-port 4

local-alerting

timeouts call-disconnect 0

!

dial-peer voice 10 voip

destination-pattern ........

ip precedence 5

session target ras

!

dial-peer voice 1 pots

destination-pattern 5258111

port 1

!

dial-peer voice 2 pots

destination-pattern 5258222

port 2

!

dial-peer voice 3 pots

destination-pattern 5258333

port 3

!

dial-peer voice 4 pots

destination-pattern 5258444

port 4

!

end