In my experience, mainly Polycom and Adtran, most SIP devices send
packets with a source port 5060. SIP ALG preserves the source port
but regular NAT changes the source port (maybe not for the first device)
just like NAT for any other service.
On 07/18/2017 10:00 AM, Colton Conor wrote:
Anyone have a tool that a technician or customer could put on a
computer on a customer's network, and it will tell them if a SIP ALG
was disabled or enabled? Or if their network was suitable for SIP
traffic?
We started deploying some Ubiquiti Unifi USG routers, and discovered
that they had SIP ALG enabled by default.
Typically we just put the Polycom VVX phones to register with TCP for
signaling, and this bypasses most SIP ALGs as I think most can only
handle SIP using UDP and not TCP right?
Well I guess the SIP ALG used in the Ubiquiti Unifi USG does modify
even SIP using TCP. I know Ubiquiti Unifi USG use a fork of the vyatta
operating system, and the command to disabled it is set system
conntrack modules sip disable
We were able to turn SIP ALG off, and now everything is working fine.
Would be great if there was a tool a low level tech or customer could
use to test the network?
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