editor
699
edits
VoIP Phones - Cisco 7xxx: Difference between revisions
m
clean up, typos fixed: to it's → to its
m (AA-Andrew moved page FireBrick VoIP Phones Cisco 7xxx to VoIP Phones - Cisco 7xxx) |
m (clean up, typos fixed: to it's → to its) |
||
| (8 intermediate revisions by 2 users not shown) | |||
|
<indicator name="VoIPConfiguring">[[File:menu-voip.svg|link=:Category:VoIP Phones|30px|Back up to the VoIP Configuring page]]</indicator>
[[file:Cisco7940.png||ALT=Cisco7940]]
==Phones and Versions Tested==
{| class="wikitable"
|3.8.6
|
|}▼
|-
|7940G
|SIP41.8-5-4S
|Appears stable
|-
|7940G
|SIP41.9-4-2SR1-1S
|Phone runs sluggish, reboots randomly, not recommended
▲|}
{| class="wikitable"
|}
==Configuration:==▼
'''* Important *'''
Whilst testing SIP41.8-5-4S it appears the phone/firmware is vulnerable to a SIP/UDP amplification attack where crafted SIP 'INVITE' packets sent on UDP 5600 cause the phone to respond to its upstream SIP gateway with multiple SIP 2.0 '404' packets. Measured at a rate of approximately 20 packets/second, whilst not a major cause for concern with a single phone could potentially cause service issues where several phones are in use.
This vulnerability is protected against by correct firewall protection/filtering limiting inbound UDP on SIP port 5600 to the phone to be exclusively from
the parent SIP service (e.g. voiceless.aa.net.uk - see the VoIP security/firewall section). '''It is not recommended to leave these phones connected to the internet without any protection.'''
==Firewall & Security==
*You will also want to set up firewall rules, as per the [[VoIP Firewall]] page.
*Also see the [[VoIP Security]] page for information about securing your VoIP service.
[[Category:VoIP Phones|Cisco 7xxx]]
| |||