poor sound quality on the echo test

Hi!

1. I'm running siproxd 1:0.5.11-1 (debian) on my NAT/Firewall.

2. When I try kphone 1:4.0.5-2, everything seems to work but I get very
poor quality sound on the FWD echo test.  Sound quality on a one-way
test is fine.  I tried linphone 1.3.3-1 and the sound quality was worse.
I could hardly hear anything on the echo test.

3. My ping time to fwd sucks:

joshua@emit:~$ ping fwd.pulver.com
PING fwd.pulver.com (69.90.155.70): 56 data bytes
64 bytes from 69.90.155.70: icmp_seq=0 ttl=44 time=371.5 ms
64 bytes from 69.90.155.70: icmp_seq=1 ttl=44 time=368.1 ms

4. I've tried with asterisk and a Grandstream phone instead of siproxd.
It works fine, echo test and all.  However, I don't want to run asterisk
if I can run siproxd instead.  Siproxd uses about 10% of the memory that
asterisk wants.  I don't need the extra features.

5. I haven't tried the Grandstream + siproxd because my phone is out for
repair.  Similarly, I couldn't get kphone to talk to asterisk for some
reason.  If nobody can suggest a solution then I'll test more
combinations.

I suspect that the only problem is that siproxd is not coping
with high latency.  Is there any config option to get better behavior
with high latency?

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