1 of 1 people found this helpful
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.
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?
As I said, I'm not expert on the 3120 and it may not have the option, but in AOS:
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
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.