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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:
>> 
>> > 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.

SIP was designed at a time when it was expected that every device would
have its own public IP address. But that isn't what happened, what
happened is NAT. So you have to work around NAT with something, or find
a way to give each of your devices a public IP address.

Some places that you phone will have systems which can correct
problems with SIP, but older systems don't.

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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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