Does Enable Highest Bandwidth Priority for SIP Traffic Require SIP ALG to Be Enabled?

DeanH

I am trying to determine what indicators the BWM feature "Enable Highest Bandwidth Priority for SIP Traffic" uses to identify the SIP traffic.  I want to enable this feature to help prioritize SIP, but we do not have SIP ALG enabled due to our VoIP system not requiring it - and it adversely affecting it at times.  So, will enabling this feature on the BWM screen do anything if we are not utilizing SIP ALG and just use port based rules for our SIP traffic?

Also, does enabling this feature remove the need to create BWM rules?

Zyxel_Jeff

Hi @DeanH

 In your scenario, you can check “Enable Highest Bandwidth Priority for SIP Traffic” and won’t add any BWM rule for SIP traffic.

Additionally, you must check “Enable SIP ALG”.

Due to those two rules must interwork with each other internally.

You just enable SIP ALG and won’t enable its other extended option. 

P.S.Those values depend on your needs

SIP Media Inactivity Timeout (1~86400)

SIP Signaling Inactivity Timeout(1~86400)

DeanH

Hello PeterUK,
Thank you for the commands.
Since we use UDP, this TCP command probably won't help much.  What specifically does it do to control the ACK?

Hello Zyxel_Jeff,
Thank you for your response.
That is what I thought.

PeterUK

I would guess its service port based and not needing the SIP ALG if not make your own rule for the ports used by SIP with high Priority.

Enabling BWM dose nothing unless you rate limit on WAN and LAN egress limits in interface under your ISP speed limits for the BWM to work.

I would also say enable this in the web console:

configure terminal

bwm control-tcp-ack

PeterUK

DeanH said:

What specifically does it do to control the ACK?

It stops the USG from bypassing the Egress rate limit you set for sent traffic when you download.