IP Phones ringing but no voice after receiving phones

[lateefstar]

Hi i have just installed ccm 4.1.2. I successfully registered 3 ip phones
1. 7940 ip address 10.1.1.30
2. 7940 ip address 192.168.0.50
3. 30 Vip ip address 192.168.1.30

Above three phones are in different location as you can see above subnet.

=> From 1 i can call 2 and vice versa. Both can receive and make calls but cant here.

=> From 1 and 2 unable to make and receive calls to 3 or from 3 unable to make and receive calls.

Any Expert Suggestion

 

[ADB100]

It is most likely a routing issue at one end. I would use traceroute to check the paths between the end-points - ensure you are tracing from the same source subnet (Voice VLAN?) at either end.

HTH

Andy

 

[lateefstar]

Thanks for replying

How do i trace route?

 

[lateefstar]

I am using static routes. My call manager ip address is 192.168.2.150. I did port forwarding to the call manager.
=============================================
static (inside,outside) udp interface tftp 192.168.2.150 tftp netmask 255.255.255.255 0 0
static (inside,outside) tcp interface 69 192.168.2.150 69 netmask 255.255.255.255 0 0
static (inside,outside) tcp interface

http://www 192.168.2.150

http://www netmask

255.255.255.255 0 0
static (inside,outside) tcp interface 2000 192.168.2.150 2000 netmask 255.255.255.255 0 0
static (inside,outside) tcp interface 3389 192.168.2.150 3389 netmask 255.255.255.255 0 0
access-list inbound permit tcp any any eq 69
access-list inbound permit udp any any eq tftp
access-list inbound permit tcp any any eq 2000
access-list inbound permit tcp any any eq 3389
access-list outbound permit udp host 192.168.2.150 host 61.29.0.0 eq tftp
access-list outbound permit tcp host 192.168.2.150 host 61.29.0.0 eq 69
=============================================

Any Suggestion please.

 

[ADB100]

Ahh...... I assumed this was a private network and the Internet wasn't involved..........

Although you have the correct control ports mapped the actual RTP streams use a random UDP port per stream (2 per conversation) in the range 16384 - 32767. Unless your routers have the ability to understand the SCCP protocol and can dynamically build the NAT translations to accomodate this it won't work. The other option is a VPN connection between the sites.

Andy

 

[lateefstar]

Thanks for reply. What is the pix command to open the above range ports.

Thanks

 

[ADB100]

I have never set this up before over NAT/PAT but there is some info on CCO:

http://www.cisco.com/en/US/products..._guide_chapter09186a008017278b.html#wp1083319

I would suggest you look into a VPN solution though - not to just protect your voice, but your applications as well. It looks like a disaster waiting to happen simply allowing access from anywhere to your CCM server.....

HTH

Andy