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Re: About 5% of outgoing calls fail with one-way sound only - fix?

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Chris Green <cl@isbd.net> writes:

> Richmond <dnomhcir@gmx.com> wrote:
>> Chris Green <cl@isbd.net> writes:
>> 
>> > Richmond <dnomhcir@gmx.com> wrote:
>> >> Chris Green <cl@isbd.net> writes:
>> >> 
>> >> > Our VOIP is a straightforward (?) Yealink DECT system, a W70B
>> >> > base station and five W73H handsets.  It works well for most
>> >> > calls but a small percentage of outgoing calls fail with 'them'
>> >> > being able to hear 'us' but we can't hear them.
>> >> >
>> >> > These are always (so far) calls to businesses or local
>> >> > government, however it is just one or two that fail, most calls
>> >> > to banks etc. work perfectly OK.  It's consistent with any
>> >> > particular destination, if it doesn't work first time then it's
>> >> > never going to work.
>> >> >
>> >> > We're with Plexatalk whose 'support' (it's a one man band I
>> >> > think) has disappeared for the moment.
>> >> >
>> >> > Is there an 'obvious' fix for this? Is it something awry at
>> >> > Plaxatalk?  Is it worth trying another VOIP provider (I'm
>> >> > tempted, given the lack of response at Plexatalk)?
>> >> 
>> >> I had a similar problem and I fixed it by switching on SIP ALG,
>> >> which is frowned upon. But it could be the same underlying problem
>> >> of packets not being routed back to the right address, because
>> >> there is no stun server perhaps.
>> >
>> > It's enabled, maybe I should disable it as recommended by most. It
>> > was enabled by default, I didn't do it.
>> 
>> You could try disabling it as can cause problems depending on the
>> implementation.
>> 
>> I am using ipv6 but that didn't help me at all because I am still
>> behind NAT.
>> 
> Surely, in the main, if you have IPV6 there's no NAT involved is
> there?

I found this video which describes the problems with SIP and NAT, and
also mentions how firewalls can get in the way.

https://youtu.be/Tb_8mZMWQjQ

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Thread

About 5% of outgoing calls fail with one-way sound only - fix? Chris Green <cl@isbd.net> - 2026-01-23 15:35 +0000
  Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-23 15:51 +0000
    Re: About 5% of outgoing calls fail with one-way sound only - fix? Chris Green <cl@isbd.net> - 2026-01-23 17:51 +0000
      Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-23 22:44 +0000
        Re: About 5% of outgoing calls fail with one-way sound only - fix? Chris Green <cl@isbd.net> - 2026-01-24 09:35 +0000
          Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-24 10:44 +0000
            Re: About 5% of outgoing calls fail with one-way sound only - fix? David Higton <dave@davehigton.me.uk> - 2026-01-24 17:27 +0000
              Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-24 17:31 +0000
            Re: About 5% of outgoing calls fail with one-way sound only - fix? David Woolley <david@ex.djwhome.demon.invalid> - 2026-01-25 12:58 +0000
          Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-24 15:47 +0000
        Re: About 5% of outgoing calls fail with one-way sound only - fix? David Higton <dave@davehigton.me.uk> - 2026-01-24 17:23 +0000
          Re: About 5% of outgoing calls fail with one-way sound only - fix? Richmond <dnomhcir@gmx.com> - 2026-01-24 17:32 +0000
            Re: About 5% of outgoing calls fail with one-way sound only - fix? David Woolley <david@ex.djwhome.demon.invalid> - 2026-01-25 12:43 +0000
  Re: About 5% of outgoing calls fail with one-way sound only - fix? Andy Burns <usenet@andyburns.uk> - 2026-01-23 16:16 +0000
    Re: About 5% of outgoing calls fail with one-way sound only - fix? Chris Green <cl@isbd.net> - 2026-01-23 17:53 +0000
      Re: About 5% of outgoing calls fail with one-way sound only - fix? David Higton <dave@davehigton.me.uk> - 2026-01-23 22:31 +0000
        Re: About 5% of outgoing calls fail with one-way sound only - fix? Chris Green <cl@isbd.net> - 2026-01-24 09:39 +0000
          Re: About 5% of outgoing calls fail with one-way sound only - fix? David Higton <dave@davehigton.me.uk> - 2026-01-24 17:18 +0000
  Re: About 5% of outgoing calls fail with one-way sound only - fix? "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-01-23 17:02 +0000

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