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Troubleshooting Tip: One way Audio issue in VOIP c ...
https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-One-way-Audio-issue-in-VOIP-calls-caused-by/ta-p/203336
This article describes how SIP ALG processes VoIP traffic and how it causes one-way audio issues. SIP ALG translates SIP and SDP parameters when the packet is sent to the SIP provider. Most of the SIP providers recommend disabling SIP ALG. Both sides send Connection Information (c=IN) to establish RTP/Audio session.
One-way audio over fortigate FW - Fortinet Community
https://community.fortinet.com/t5/Fortinet-Forum/One-way-audio-over-fortigate-FW/m-p/43850
One-way audio over fortigate FW. Hi team, I need your help in a one way audio in a network. The design is a bit complex and is a follows: - fortigate acts an internal firewall --> connected to Cisco FW --> Service provider - the voice server is at the service provider premises I can make calls from the internal network to any phone to remote sites (they don' t have …
Technical Tip: VOIP calls (using SIP) - Fortinet Community
https://community.fortinet.com/t5/FortiGate/Technical-Tip-VOIP-calls-using-SIP/ta-p/193831
It is necessary to create a VIP that accommodates the range of UDP ports that is specified by your SIP provider for RTP/Audio. Failing to do so, will likely result in one-way audio (outgoing audio is ok, cannot hear remote side). Also need to make sure that the SIP-phone is configured to use the same accepted range of audio ports.
Fortigate issues such as one way audio on Call Pickup With ...
https://www.cyber-cottage.co.uk/?p=1625
Fortigate issues such as one way audio on Call Pickup With Hosted Asterisk and other problems. We have noted that with some Fortigate routers and firewalls come with SIP helpers enabled by default. The customer may initially not think that there is any issue and inbound and outbound calls work as expected, But we had noted on one customer site that when they did a call pickup …
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.
Solved - Yet another one way audio post, outbound SIP ...
https://www.3cx.com/community/threads/yet-another-one-way-audio-post-outbound-sip-trunk-calls-called-party-can-not-hear.62013/
External calls to our SIP trunk have one-way audio, the called party can not her me but I can hear them. Here's some information... On premise 3CX version 15.5.15502.6 One SIP trunk with SIP.US PBX Delivers Audio is checked on the trunk Firewall tests all pass Firewall is Fortigate FG100D v6.0.3 build0200 (GA) SIP ALG is disabled per this document:
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