[c-nsp] Cisco one-way voice problem

[Mick Hastings]

Hi,

Im no expert but I hear that this is a very common probelm with VoIP and 
NAT.  Something to do with the upper layer protocols dynamically assiging 
UDP ports for RTP.

look at another list on here called gmane.comp.telephony.pbx.asterisk.user, 
there is a lot of info about VoIP and one way audio there.

cheers,
Mick

"Saad" <saadbutt at mail.com> wrote in message 
news:41C31D29.A69ED73D at mail.com...
>I have a small remote office VoIP setup and I am facing a problem. I am
> using a Cisco 2612 Router with NM-2V module. One FXO and one FXS card is
> installed on the voice module. The internet access is through ISDN line.
>
> The problem that I am facing is that when I make calls to the router to
> any of FXO or FXS interface the office people can not hear me. On the
> other hand when the office guys call me I can hear them but they cant.
> I am pasting the ISDN dialup and voice port configuration here. Could it
> be access list problem or something else?
>
>
> interface Ethernet0/0
> description connected to EthernetLAN
> ip address 192.168.0.101 255.255.255.0 secondary
> ip nat inside
> half-duplex
> !
> interface TokenRing0/0
> no ip address
> shutdown
> ring-speed 16
> !
> interface BRI0/0
> no ip address
> ip nat outside
> encapsulation ppp
> dialer rotary-group 1
> isdn switch-type basic-net3
> no cdp enable
> !
> interface Dialer1
> ip address negotiated
> ip nat outside
> encapsulation ppp
> no ip split-horizon
> dialer in-band
> dialer idle-timeout 0
> dialer redial interval 60 attempts 5
> dialer string 10001001
> dialer hold-queue 10
> dialer load-threshold 1 either
> dialer-group 1
> no cdp enable
> ppp authentication chap pap callin
> ppp pap sent-username test password 7 03105E080E
> ppp multilink
> !
> ip nat inside source list 1 interface Dialer1 overload
> ip classless
> ip route 0.0.0.0 0.0.0.0 Dialer1
> no ip http server
> !
> access-list 1 permit 192.168.0.0 0.0.0.255
> dialer-list 1 protocol ip permit
> !
> snmp-server community public RO
> snmp-server enable traps tty
> !
> voice-port 1/0/0
> !
> voice-port 1/0/1
> !
> voice-port 1/1/0
> ring number 4
> !
> voice-port 1/1/1
> ring number 4
> !
> dial-peer cor custom
> !
> !
> !
> dial-peer voice 1 pots
> destination-pattern 101
> port 1/0/0
> !
> dial-peer voice 2 pots
> destination-pattern 102
> port 1/0/1
> !
> dial-peer voice 3 pots
> destination-pattern 103T
> port 1/1/0
> !
> dial-peer voice 4 pots
> destination-pattern 104
> port 1/1/1
> !
> dial-peer voice 100 voip
> destination-pattern 34T
> session target ipv4:80.32.170.82
>
>
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