New install router phones and call quality issues.

[craigps]

Hello all. Have an instance hosted by 3cx, v20 update 7. All Yealink t54w phones, each setup as its own router phone, total of 16 on the network, all with most recent 3cx firmware. Customer reports issues, randomly, with an echo when they answer, sometimes a little delay when calls first answered 1 or 2 seconds, also sometimes the person calling in say they are hard to hear. All desktop phones, no app use or web client. Also, these were connected to an existing dhcp network, comcast business, 300mb, reported no issues on internet connection. I have no access to existing switches or firewall. Firewall is Cisco meraki so SIP ALG not an issue. Used call monitoring tool built in to 3cx and reports excellent call quality on all calls of monitored extension, other than orange color 110ms or so roundtrip time. Any help appreciated.

 

[craigps]

Hello all. Have an instance hosted by 3cx, v20 update 7. All Yealink t54w phones, each setup as its own router phone, total of 16 on the network, all with most recent 3cx firmware. Customer reports issues, randomly, with an echo when they answer, sometimes a little delay when calls first answered 1 or 2 seconds, also sometimes the person calling in say they are hard to hear. All desktop phones, no app use or web client. Also, these were connected to an existing dhcp network, comcast business, 300mb, reported no issues on internet connection. I have no access to existing switches or firewall. Firewall is Cisco meraki so SIP ALG not an issue. Used call monitoring tool built in to 3cx and reports excellent call quality on all calls of monitored extension, other than orange color 110ms or so roundtrip time. Any help appreciated.

Forgot to add, with all phones being setup as router phones, any changes or ports need to be opened on firewall?

 

[CentrexJ]

Are there any quality issues for internal extension to extension calls?

 

[craigps]

Are there any quality issues for internal extension to extension calls?

I am not sure, I will reach out to them and find out. If not, what would that indicate? I assumed since all phones are setup as router phones, all of the internal extension to extension calls would not really be handled any different than an external. Not like a local lan sbc where it would keep the extension calls internal

 

[CentrexJ]

You are correct but if internal calls are ok but external not then check sip provider.

 

[craigps]

You are correct but if internal calls are ok but external not then check sip provider.

Yeah. Flow route is the provider and they haven’t identified any issued

 

[KyriacosS_3CX]

1. You do have a relatively high Round Trip to the phones - any chance the network there is congested?

2. Reboot a few phones and see if the calls normalise.

3. Open a browser session from inside the phones network - see if calls to that are OK, to focus on phones or the network itself.

 

[craigps]

1. You do have a relatively high Round Trip to the phones - any chance the network there is congested?

2. Reboot a few phones and see if the calls normalise.

3. Open a browser session from inside the phones network - see if calls to that are OK, to focus on phones or the network itself.

Thank you....we don't seem to have any other congestion on network. Pretty small setup with 16 computers and phones. Will try rebooting phones.....also can you clarify the comment on opening a browser session and seeing if calls to that are ok?

 

[bitn2]

.also can you clarify the comment on opening a browser session and seeing if calls to that are ok?

Open an webclient in the same network as your phones and try a call from there.

 

[craigps]

Open an webclient in the same network as your phones and try a call from there.

ok..thanks

 

[craigps]

Update - Reaching out to the network support vendor today and asking them to create the voice vlan on router/switches and prioritize the traffic, since all phones are lldp, they should have no issue getting on the right vlan. it does not sound like this was done prior to install