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While SIP interoperability in general has made significant progress, it is still required to test interoperability with each and every ITSP to make sure all the required features for successful SIP trunking work. the following is the current list of ITSPs that we were able to test against. This list highly depends on the availability of suitable test accounts. Should your preferred provider be missing and you would like to get it added, please say so on the sipx-dev mailing list. If you can provide a test account together with your request, then that would increase the chances of getting help with resolving interoperability issues.

Required parameters for different ITSP

Provider (ITSP)

Domain ITSP

Server Address

Global addr

Registrar

Reg On Init

Default Asserted Identity

SIP keepalive

RTP keepalive

bandwidth.com

ot.bandwidth.com

n/a (blank)

true

n/a

false

true

CR-LF

NONE

att.com

Specified by AT&T

n/a (blank)

true

n/a

false

true

CR-LF

NONE

bt.com

sip.ser-001.nat.bt.com

81.144.230.5

false

default

true

true

CR-LF

replay last sent packet

cbeyond.net

sipconnect-fca.atl0.cbeyond.net

sip-proxy-fca.atl0.cbeyond.net

true

default

true

true

CR-LF

NONE

voxitas.com

wdc01a.netlogic.net

wdc01a.netlogic.net

false

default

true

true

CR-LF

NONE

sipcall.ch

voipgateway.org

n/a (blank)

true

default

true

true

CR-LF

replay last sent packet

callwithus.com

sip.callwithus.com

n/a (blank)

true

default

true

true

CR-LF

empty packet

voipuser.org

sip.voipuser.org

n/a (blank)

false

default

true

true

CR-LF

empty packet

les.net

did.voip.les.net

n/a (blank)

false

default

true

true

CR-LF

empty packet

eutelia.it

voip.eutelia.it

n/a (blank)

true

default

true

true

CR-LF

empty packet

vitelity.net

vitelity.net

outbound.vitelity.net

true

inbound8.vitelity.net (supplied by ITSP)

true

true

CR-LF

empty packet

vitaltalk.com

vitaltalk.com

chicago-1a.vtnoc.net

true

default

true

true

CR-LF

replay last sent packet

voip.ms

voip.ms

n/a (blank)

true

default

true

true

CR-LF

NONE

callcentric.com

callcentric.com

204.11.192.31 (pick same registrar and proxy address) false

204.11.192.31

true

true

CR-LF

NONE`

simplesignal.com

sip.myvtel.com

n/a (blank)

true

default

true

uncheck ( leave PAI blank )

CR-LF

NONE

bluesip.net

bluesip.net

leave blank

true

default

true

true

CR-LF

NONE

unlimitel.ca

unlimitel.ca

sip.unlimitel.ca

true

default

true

uncheck (leave PAI blank)

CR-LF

replay last sent packet

flowroute.com

sip.flowroute.com

n/a (leave blank)

true

default

true

true

CR-LF

replay last sent packet

...