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Cloud Voip Phones BLF's Not working

Hi,

I have a network that newly had 70 cloud hosted phones installed at a hotel. The 10 Staff phones all have BLF enabled on them but they worked on some phone and not on others then finally they stopped altogether. The phones are on the Gamma Horizon platform and are Poly phones

I've checked the MTU and it's set at 1500 as per the phone company's spec and I can't seen anything that stands out ion the logs. I've disabled SIP ALG and applied the below KB's

Sophos XG Firewall: VoIP calls may drop or encounter poor quality

Sophos XG Firewall v17: Understanding 'Invalid Traffic' log entries caused by the connection being timed out from conntrack

Can anybody suggest anything?

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0 rfcat_vk over 3 years ago

Hi,

check the GUI -> IPS page for entries.

ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Mandy Smith over 3 years ago in reply to rfcat_vk

Hi Ian,

I had a look at the IPS logs and I can only see 3 hits but there not effecting the Voice network.

Thanks,
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0 Mandy Smith over 3 years ago

As far as I can see this seems to be a big issue with the XG firewall interfering with SIP traffic. I have a case open but I'm waiting for the Engineer to get back to me as his command for the CLI isn't working

tcpdump -vni any -s0 port 5060

returns unknown parameter "any"
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0 rfcat_vk over 3 years ago in reply to Mandy Smith

Hi Mandy,

please post a copt of your firewall rule regarding the VoIP access.

Regarding VoIP policies have you created any?

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Mandy Smith over 3 years ago in reply to rfcat_vk

See below for the VoIP Policy. Let me know if there is anything else you need?
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0 rfcat_vk over 3 years ago in reply to Mandy Smith

Hi Mandy,

I was asking about policies like these not firewall rules where e you apply policies.

I have added services because one of my VoIP phones occasionally likes to use other services.

I have included the web policy which was developed when I was using v17, but is no longer relevant for v18.

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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added text about the web policy.
[edited by: rfcat_vk at 10:47 PM (GMT -8) on 27 Dec 2020]
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0 Mandy Smith over 3 years ago in reply to rfcat_vk

Thanks for the suggestion however this didn't work. Do you know how to stop UDP fragmentation on the firewall?
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0 rfcat_vk over 3 years ago in reply to Mandy Smith

Hi Mandy,

I would suggest you ask the support guy, but in the meantime look at the WAN configuration regarding MTU etc.

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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