Path: csiph.com!server.example.net!weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Richmond Newsgroups: uk.telecom.voip Subject: Re: About 5% of outgoing calls fail with one-way sound only - fix? Date: Fri, 23 Jan 2026 15:51:47 +0000 Organization: Frantic Message-ID: <82v7gsiay4.fsf@example.com> References: MIME-Version: 1.0 Content-Type: text/plain Injection-Info: solani.org; logging-data="587231"; mail-complaints-to="abuse@news.solani.org" User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:KJQ/NQlhwXHULQPx8fJlviGo/F8= sha1:qsF+phA7UdwXojdgCTvzd6Bu6BU= X-User-ID: eJwVyMERwCAMA7CVcLBN1gES9h+hVz2lafguWqaeXgAxRh8EqcqVAONvB2pudDsblOuwuvID8fAQKw== Xref: csiph.com uk.telecom.voip:9092 Chris Green 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.