Time to connect between SIP phones

Hello
I have Aastra and linksys SIP phones which show at the CLI

asterisk*CLI> sip show peers
Name/username Host Dyn Nat ACL Port Status
700/700 192.168.2.200 D N A 5063 OK (12 ms)
490/490 192.168.2.209 D N A 5060 OK (316 ms)
480/480 192.168.2.208 D N A 5060 OK (137 ms)
460/460 192.168.2.206 D N A 5060 OK (134 ms)
450/450 192.168.2.205 D N A 5060 OK (131 ms)
430/430 192.168.2.203 D N A 5060 OK (139 ms)
420/420 192.168.2.202 D N A 5060 OK (144 ms)
400/400 192.168.2.200 D N A 5060 OK (13 ms)
390/390 192.168.2.209 D N A 5060 OK (310 ms)
380/380 192.168.2.208 D N A 5060 OK (94 ms)
330/330 192.168.2.203 D N A 5060 OK (95 ms)
320/320 192.168.2.202 D N A 5060 OK (220 ms)
300/300 192.168.2.200 D N A 5062 OK (12 ms)
290/290 192.168.2.209 D N A 5060 OK (315 ms)
280/280 192.168.2.208 D N A 5060 OK (95 ms)
230/230 192.168.2.203 D N A 5060 OK (110 ms)
220/220 192.168.2.202 D N A 5060 OK (222 ms)
200/200 192.168.2.200 D N A 5061 OK (12 ms)
24 sip peers [Monitored: 20 online, 0 offline Unmonitored: 4 online, 0 offline]
asterisk*CLI>

Time differential is huge between brands. Aastra phones all have 94+ms and Linksys SPA942 are 12-13ms. All on same network segment. asterisk server: asterisk v1.6 on Centos 5.2 SIP calls can take between 4-9 sec to setup & go thru - IAX2 calls to SIP extensions take

Am I missing something in my aastra.cfg set-up?

#aastra default config file for 480i, 9133i
# Network and gateway
dhcp: 1
sip proxy ip: 192.168.2.12
sip proxy port: 5060
sip registrar ip: 192.168.2.12
sip registrar port: 5060
sip digit timeout: 6
xml application post list: 192.168.2.12
default gateway: 192.168.2.1

# DTMF settings
sip use basic codecs: 1
# use Ulaw codec only
#sip dtmf method: 1
# use SIP info signaling only
#sip sip out-of-band dtmf: 0
# disable out-of-band DTMF

#dns
dns1: 192.168.2.12
dns2: 192.168.2.1
#dns3: 208.67.222.222

# Time & Date
time server disabled: 0
time server1: 192.168.2.12
time server2: 136.159.2.2 #ntp.cpsc.ucalgary.ca
time format: 1
time zone name: CA-Mountain
time zone code: MST
dst config: 3
date format: 7

# Syncronization
download protocol: tftp
tftp server: 192.168.2.12
Auto Resync mode: 3
Auto Resync time: 04:30

# Phone-to-phone intercom
sip intercom type: 2
sip intercom prefix code:*96
sip intercom line: 1
sip allow auto answer: 1
sip intercom mute mic: 0

# multi line ring tones
line1 ring tone: 0
line2 ring tone: 1
line3 ring tone: 2

# Missed Calls Indicators - all phones

missed calls indicator disabled: 1

#############################################

Thanks Mark