[Freeswitch-users] codec negotiation error

Brian West brian at freeswitch.com
Mon Aug 8 21:54:43 UTC 2022

Focus on the NAT issue between the phone and FreeSWITCH.


On Mon, Aug 8, 2022 at 4:47 PM Brian May <brian at linuxpenguins.xyz> wrote:

> Brian West <brian at freeswitch.com> writes:
> > you probably have a nat issue, what's the topology like? What is ext-*-ip
> > set to, and what is local-network-acl set to?
> provider (internet) <--firewall--> Freeswitch (external IP) <--firewall-->
> Phone (internal IP)
> Freeswitch is outside the NAT, and looking at the packets, it is sending
> the correct IP addresses to the provider.
> All firewalls are whitelisted to send all UDP 1024-65535 through.
> As far as freeswitch is concerned there is no NAT. Unless I try to get
> the phone to talk directly to the provider. Which is something I am not
> even attempting to do right now.
> local-network-acl is set to localnet.auto
> If there was a codec negotiation issue, what would the symptoms be? I
> would expect dropped phone calls, not dropped audio. So I don't think
> that is what I am experiencing here.
> My gut feeling is that the remote provider is sending audio (wish I
> could prove it) which means traffic is getting blocked somewhere - most
> likely my firewall. So will concentrate my efforts here. Starting of by
> disabling SIP support in my firewall.
> https://community.ui.com/questions/VoIP-SIP-Phone-through-NAT-on-EdgeMax/0632ce0e-9b8d-4bf0-907f-ac55485e32e6
> --
> Brian May <brian at linuxpenguins.xyz>
> https://linuxpenguins.xyz/brian/


Brian West | Co-founder and Developer

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