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change sip trunk source port ?

is there a way to change the contact port for a sip trunk

I have an instance where ONE trunk is accepting calls for either of the defined trunks

eg a call routed to sip T02  is going to sip T01

Trunks are registered with distinct account/user info

The server is sending to the device on what it thinks is the appropriate channel/account

All calls coming into the device are always coming in on the first channel

I an thinking if the sip trunk source ports could be changed then the outbound calls would route to the proper channel, as the port would define the 'trunk'

Thoughts ????

--SIP Trunk Configuration --

voice trunk T11 type sip

  description " SIP - Trunk1"

  match ani "NXX-NXX-XXXX" substitute "1-NXX-NXX-XXXX"

  sip-server primary *****.net

  registrar primary *****.net

  registrar threshold absolute 60

  outbound-proxy primary ******.net

  register 200250 auth-name "2000" password "AAAAAAAAAA"

  codec-list voip both

  authentication username "2000" password "AAAAAAAAAA"

!

voice trunk T12 type sip

  description "Voiceway SIP - Trunk2"

  match ani "NXX-NXX-XXXX" substitute "1-NXX-NXX-XXXX"

  sip-server primary *****.net

  registrar primary *****.net

  registrar threshold absolute 60

  outbound-proxy primary *****.net

  register 200251 auth-name "3000" password "BBBBBBBBBB"

  codec-list voip both

  authentication username "3000" password "BBBBBBBBBB"

!

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