port forward help

[avvo]

Could someone please help.

I have no experience with netvanta.

I need to open ports for VOIP but my default interface has dynamic ip.

The only video tutorial that shows how to open is only for static ip addresses.

My phone guy run wireshark and told me that he see the SIP service is registering to the voip.ms server but there is no VoIP packets leaving the router asking for invite and acceptance. All he see is the IP address of the PBX (192.168.2.161 via 192.168.2.1) getting a standard response from the voip.ms server (67.205.74.187) saying yes I am here, what do you want to do. See the attached files.

I need to verify that the router is passing the SIP service information to the voip.ms

Im attaching my netvanta 3120 config and wireshark test results

Thank you

[jayh]

I'm not a 3120 expert, deal more with the TA900 series but you have:

no ip firewall alg sip

and you don't have sip transparent proxy enabled.

Generally you want one or the other to properly handle SIP NAT. 

[avvo]

Thank you for your reply.

could you please let me know or guide me where i can find any reference on how to enable sip transparent proxy?

[jayh · Accepted solution]

As I said, I'm not expert on the 3120 and it may not have the option, but in AOS:

ip sip

ip sip proxy

ip sip proxy transparent

If these options aren't there, then turn on the SIP ALG with:

ip firewall alg sip

The following may also help:

ip rtp firewall-traversal

[Anonymous]

:

I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post and unmark it and select another in its place with the applicable buttons.  If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.

Thanks,

Levi