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site to site vpn - One way audio on SIP phone on one call ...
https://serverfault.com/questions/15116/one-way-audio-on-sip-phone-on-one-call-direction-where-to-look-next
If it was a codec issue, you'd have no audio, because the phones would be unable to send audio between each other. One way audio is almost always caused by RTP not passing through. Per DLux's statement, turning off SIP ALG or SIP Fixup or SIP Transformation - different routers use different terms for the same thing - is a good first step.
one way audio with SIP trunk through a site-to-site VPN ...
https://community.cisco.com/t5/ip-telephony-and-phones/one-way-audio-with-sip-trunk-through-a-site-to-site-vpn-issue/td-p/4009491
I have a problem that calls through VPN connection between two sites with sip trunk are established well (Signaling) but for media (RTP) they sometimes are one-way audio or no audio at all. There is a VPN connection between two sites by Fortigate. The VPN is working well. There is call manager CUCM in both sites, one is v12 restricted and another v8.5 …
One-way Audio over Site-to-Site VPN at Remote Sites ...
https://community.freepbx.org/t/one-way-audio-over-site-to-site-vpn-at-remote-sites/51675
However when I place a call from a Remote Site to the Main Site or another Remote Site, I see the Outbound SIP traffic (port 5060) go out over the Remote Sites WAN connection and not the VPN and there is no RTP port traffic displayed (hence the one-way audio).
Solved: One-Way voice in a call over VPN - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/one-way-voice-in-a-call-over-vpn/td-p/2232262
One-Way voice in a call over VPN. We have a problem with the calls when they come from a user connected through VPN. The topology is the next: VPN User->ASA->ROUTER->User in office. Both users are in inside interface and the command " same-security-traffic permit intra-interface" is configured so the traffic is allowed.
VPN One-Way Audio | 3CX Forums
https://www.3cx.com/community/threads/vpn-one-way-audio.73363/
When at home, they experience one-way audio while connected to the VPN and cannot hear the caller. Their audio is transmitted just fine, and the On-Premise 3CX receives external caller audio. However, the RTP stream is addressed to the user's Home LAN IP, not the VPN IP. Since it's not a Site2Site VPN, there is no direct route to the Home LAN IP...
How to resolve one-way or no-way audio on VoIP calls
http://info.teledynamics.com/blog/how-to-resolve-one-way-or-no-way-audio-on-voip-calls
One of the most common challenges involves a technology called Network Address Translation (NAT), which for data networks has been a godsend, but if not configured carefully, could cause problems for voice applications. In particular, NAT is a common cause of one-way and no-way audio on VoIP calls.
Experiencing One Way Audio When Connecting via SIP
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PLooCAG
Experiencing one-way audio when connecting via SIP (Session Initiation Protocol). Environment PAN-OS Cause SIP (Session Initiation Protocol) allows two endpoints to establish media sessions with each other. This is an application layer signaling protocol. The main signaling functions of the protocol are as follows: – Location of an end point.
How to troubleshoot one-way and no-way audio on VoIP …
http://info.teledynamics.com/blog/how-to-troubleshoot-one-way-and-no-way-audio-on-voip-calls
One security component of a firewall specifically designed for voice is the SIP Application Layer Gateway (ALG). SIP ALG is a firewall setting that can either be enabled or disabled -- generally, the audio issues occur when it's enabled. (3) Incompatible Codecs
ONE WAY AUDIO ISSUE - Discussions - Sophos (XG) Firewall ...
https://community.sophos.com/sophos-xg-firewall/f/discussions/73823/one-way-audio-issue
Remote phones can register successfully. Extension to Extension calls work Peer to Peer with bi-directional audio no issues. Local phone to SBC work fine for outbound calls. However remote IP Phone have one way audio from the SBC. XG Firewall replaced a previous Fortigate at HQ with the IPSEC VPN re-established to the branch Fortigate.
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