cloud voice express app
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I have a yealink hub/phone and the IOS version of the voice express app.
- The yealink hub/phone works, making and receiving calls.
- When the mobile phone is on the sim card (ee) the IOS voice express app works making and receiving calls.
- When the mobile phone is on the house broadband (also used by yealink) the phone IOS voice express app will dial and connect to an external number but there is no sound either way.
The broadband is terminated by a Fortigate firewall:
- The yealink hub is on a separate interface on the firewall and is cabled connected.
- I have done the SIP ALG/Helper disabling on the fortigate to get the yealink phone working.
- When the IOS voice express app is used to dial, the fortigate firewall shows no connection/ports being blocked for the phone.
The firewall rules for the IOS voice express app are as per the customer-firewall-lan-guide.pdf, and by that I mean:
- All of the service ports section, and for the iPhone these parts of the applications section: HTTPS, NTP, DNS, TCP 8443. As I said above I see no failures in the firewall logs for either the yealink hub or the IOS voice express app.
Any ideas what is preventing voice on the IOS voice express app when a connection is dialled and established, with my firewall in the way?
I do realise that the IOS app is designed for out of office use and here it is being used in-office, but that is because it is so handy. Also this in-office use means that there are two sip hubs (Yealink and IOS voice express app) behind the firewall with one external IP (IPv4 with NAT).
Regards
Keith
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Hi kmca
This is something I want the CVE team to look into further, can you please send over a private message with some account details?
^BethM
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Here are 3 possible reasons why the Voice Express app is experiencing no sound on calls over Wi-Fi:
RTP Port Misconfiguration: While firewall rules might be allowing connections, ensure the Fortigate is configured to pass Real-time Transport Protocol (RTP) audio streams. Verify if specific RTP ports used by the app are being translated correctly by NAT or if specific rules are needed for them. Refer to Voice Express documentation or Yealink support for their recommended RTP ports.
Network QoS: Prioritize voice traffic on the network. Configure Quality of Service (QoS) rules on the Fortigate to prioritize traffic from the Voice Express app and Yealink phone to ensure smooth audio transmission. This reduces the likelihood of packet drops or delays that can cause choppy or no sound.
App/Device Settings: Double-check app and device settings related to audio output. Confirm the Voice Express app's audio output is directed to the appropriate device (phone speaker, headphones) even when on Wi-Fi. Also, ensure the iPhone's sound settings haven't inadvertently muted specific apps or calls.
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It seems like the Fortigate firewall may be playing a role in the lack of sound when the iOS voice express app is used in-office; considering adjusting firewall settings or exploring potential conflicts to ensure a seamless communication "game" within the network.