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New Contributor

Has anyone been able to trunk together 2 TA908e devices?

We have two TA908e with amphenol cable connnections and we would like to have one where the PRI comes in and it'll hand off over a trunk to the other adtran if the main one does not have the extension.

example:

Call comes into Adtran 1 for extension 2001

Adtran 1 only has extensions 1001-1024

Call routing rule to send calls looking for extensions 2001-2024 to adtran 2

Send call over trunk to adtran 2

Call goes out amphenol connection to extension.

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5 Replies
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Valued Contributor
Valued Contributor

Re: Has anyone been able to trunk together 2 TA908e devices?

Since it is PRI to the service provider and SIP to "ADTRAN 2" you will basically be following this guide:

IP Business Gateway PRI to SIP PSTN Gateway Sample Configuration

where the "PBX IP address" is the IP address of "ADTRAN 2", and the "accept <DIDs/DID patterns>" will be something like "accept 20XX" or you can get more specific if you'd like.

Of course ADTRAN 2 will have to have a SIP voice trunk configured pointing to ADTRAN 1 or it won't accept any calls from it.

Hope this helps,

Patrick

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Honored Contributor
Honored Contributor

Re: Has anyone been able to trunk together 2 TA908e devices?

Yes, relatively easily done. You need a trunk between the two Adtrans either SIP or PRI. Same basic scenario whether the trunk between the two TA900s is SIP or PRI. On the first one you create a voice grouped-trunk including the trunk to the second one. Allow the extension(s) homed on the second one over that trunk with cost 0. Can be bidirectional if you need it, just duplicate in the other direction.

A PRI trunk between the two will have much lower latency and avoid modem/fax/echo issues with TDM-RTP-TDM conversion but are a bit trickier to set up than SIP. You'll need a T1 crossover cable, provision one as role network and one as role user, and sort out the clocking issues between the carrier, TA900s, and any PBX involved.

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New Contributor

Re: Has anyone been able to trunk together 2 TA908e devices?

Using the PRI with a T1 crossover would be optimal. Do you happen to have any documentation on this?

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Anonymous
Not applicable

Re: Has anyone been able to trunk together 2 TA908e devices?

Something like this would work:

//ADTRAN1

interface t1 0/4

  tdm-group 1 timeslots 1-24

  no shutdown

!

interface pri 1

  connect t1 0/4 tdm-group 1

  role network

  no shutdown

!

isdn-group 1

  connect pri 1

!

voice trunk T01 type isdn

  connect isdn-group 1

!

voice grouped-trunk PRI

  trunk T01

  accept 20XX

//ADTRAN2

interface t1 0/4

  tdm-group 1 timeslots 1-24

  no shutdown

!

interface pri 1

  connect t1 0/4 tdm-group 1

  role user

  no shutdown

!

isdn-group 1

  connect pri 1

!

voice trunk T01 type isdn

  connect isdn-group 1

!

voice grouped-trunk PRI

  trunk T01

  accept $

Note the accept on the ADTRAN1 grouped-trunk to get calls destined to 20XX to ADTRAN2.

Note the user role on ADTRAN2 pri 1 interface.

Regards,

Geoff

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Honored Contributor
Honored Contributor

Re: Has anyone been able to trunk together 2 TA908e devices?

On the primary TA908e:

interface t1 0/4

  tdm-group 1 timeslots 1-24

  no shutdown

!

interface pri 4

  connect t1 0/4 tdm-group 1

  role network

  no shutdown

!

isdn-group 4

  connect pri 4

!

voice trunk T04 type isdn

  connect isdn-group 4

!

voice grouped-trunk TIE-TK

  trunk T04

  accept 20XX

On the expansion TA908e

timing-source t1 0/4

!

interface t1 0/4

  tdm-group 1 timeslots 1-24

  no shutdown

!

interface pri 4

  connect t1 0/4 tdm-group 1

  role user

  no shutdown

!

isdn-group 4

  connect pri 4

!

voice trunk T04 type isdn

  connect isdn-group 4

!

voice grouped-trunk TIE-TK

  trunk T04

  accept $