[Freeswitch-users] RTP media issue

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Sent from my iPad

On May 24, 2012, at 5:01 PM, Nathan Downes <nathandownes at hotmail.com> wrote:

 Hi,

I had previous reported an issue with poor voice quality, appearing to stem
from occasion wrong timestamps coming from provider, but the end user's
experience was much worse than what I could see/hear in the trace.

I have finally captured an event inbound and outbound.  The thing I don't
understand is I thought even though FS proxied the media it didn't touch it
or change anything, but it appears it is.

The 2 traces are http://www.nortec.com.au/inbound.pcap.gz and
http://www.nortec.com.au/outbound.pcap.gz

Inbound is from my trunk provider to FS box and outbound is FS box to ATA
in FTTH GPON.

The event I am talking about, if both traces are open, is in the inbound
one inbetween packet 8114 and 8117 the provider drops a packet or I don't
receive it.  In the corresponding outbound trace, between packet 8144 and
8152,  it appears FS misses a whole heap of packets (.1 seconds) between
8146 and 8152 then it increases the timestamp only by 40 rather than 160 on
packet 8152.  This seems to not affect SIP phones themselves but causes
issues with the FTTH GPON ATA.

This causes a gap in the audio for the end user, and when they miss a high
number of packets even though it sounds good on the inbound trace the end
users experience is horrible.   This trace is actually a good one, but the
wrong timestamp can occur once per second, causing end user to lose 10%+ of
incoming audio only.  The issue only affects the audio coming from provider
to FS to end user.

I am chasing it up with the voice provider to try and eliminate the
occasional packet loss, but if I could stop/fix FS from doing its
adjustment/gap/something the end user wouldn't even notice it.



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