[asterisk-users] Latency woes, qos the fix?

[Stephen Reese]

My latency is kind of high and the voice delay is noticeable.

The Asterisk server is on a dedicated host outside of the network. I
am performing PAT/NAT using a Cisco router.

ns1*CLI> sip show peers
Name/username              Host            Dyn Nat ACL Port     Status
vitel-outbound/rsreese     64.2.142.22                 5060     Unmonitored
vitel-inbound/rsreese      64.2.142.116                5060     Unmonitored
101/101                    68.156.63.111    D   N      1038     OK (133 ms)

This seems pretty high when my ping time from a host on the same
network is ~30ms:

Pinging 209.251.157.93 with 32 bytes of data:
Reply from 209.251.157.93: bytes=32 time=30ms TTL=51
Reply from 209.251.157.93: bytes=32 time=27ms TTL=51
Reply from 209.251.157.93: bytes=32 time=36ms TTL=51
Reply from 209.251.157.93: bytes=32 time=28ms TTL=51

Any suggestions or is this normal?

Should I enable qos on my Cisco 3725 router and 2950 switch?

Would I also need to enable the following in the sip.conf

;tos_sip=cs3                    ; Sets TOS for SIP packets.
;tos_audio=ef                   ; Sets TOS for RTP audio packets.
;tos_video=af41                 ; Sets TOS for RTP video packets.
;tos_text=af41                  ; Sets TOS for RTP text packets.

;cos_sip=3                      ; Sets 802.1p priority for SIP packets.
;cos_audio=5                    ; Sets 802.1p priority for RTP audio packets.
;cos_video=4                    ; Sets 802.1p priority for RTP video packets.
;cos_text=3                     ; Sets 802.1p priority for RTP text packets