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New Contributor III

TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines. What are the disadvantages?

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Does anyone know what the advantages or disadvantages are to delivering analog lines through FXS ports on a TA 900/900e as a MGCP VOIP/IAD.  Is this as secure as Voice User and SIP?


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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines. What are the disadvantages?

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The advantages & disadvantages really depend on the feature & services offered by the ITSP. That being said, an ITSP looking for more flexibility, feature support, and call control options "in the gateway"; then SIP
is the way to go. However, if they prefer less flexibility in the gateway, in which all Intelligence, call control and features are handled by the upstream Softswitch/Feature server; then MGCP is the better option. They should also consider the technical depth of their staff, as SIP configuration in the gateway is more complex than MGCP.

In regards to security, MGCP is more secure in this type of deployment. By moving intelligence to the gateway/customer premise (with SIP); there's greater potential for sniffing/capturing information from the SIP/SDP; not to mention hijacking the device and placing calls. With MGCP, less harmful/sensitive information is sent with the call control, and Hijacking is virtually impossible (since it only communicates with configured Call Agents).

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Contributor
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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines. What are the disadvantages?

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The advantages & disadvantages really depend on the feature & services offered by the ITSP. That being said, an ITSP looking for more flexibility, feature support, and call control options "in the gateway"; then SIP
is the way to go. However, if they prefer less flexibility in the gateway, in which all Intelligence, call control and features are handled by the upstream Softswitch/Feature server; then MGCP is the better option. They should also consider the technical depth of their staff, as SIP configuration in the gateway is more complex than MGCP.

In regards to security, MGCP is more secure in this type of deployment. By moving intelligence to the gateway/customer premise (with SIP); there's greater potential for sniffing/capturing information from the SIP/SDP; not to mention hijacking the device and placing calls. With MGCP, less harmful/sensitive information is sent with the call control, and Hijacking is virtually impossible (since it only communicates with configured Call Agents).

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New Contributor III

Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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That is exactly what I was thinking... MGCP is great for provisioning folks because the majority of our Phone service is currently rolled out on EMTAs.  We also like the way it fits into the Databases and billing system on the periphery.  Security is more of a concern for the OffNet subscriber so we will be able to force Authentication through our softswitch Remote Media Gateway models, and can check off that Box.

The real worry now is the credit card machines, alarms systems and fax machines.  That may be problematic.  Have you tested any of these?

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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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I have tested all three and I have found Adtran to be really good with these.

  • Credit card - never had a problem
  • Fax - 95% or better
  • Alarms - Usually not a problem but it depends on the central station

Make sure you have the configuration properly set for data/fax transmission.

Ultimately it will depend on the quality of the connection.

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New Contributor III

Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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That sounds good...  do you find that you still need to add modem passthrough for all these instances?  T38 for all fax lines, or do you let it fly with G711 only?

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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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I have it configured for both modem-passthrough and t38.

At times I do have to tweak the t38 settings for faxing but usually the default settings work fine.

Here is a document that has more info on the t38 options:

https://supportforums.adtran.com/servlet/JiveServlet/previewBody/1827-102-3-3616/T.38%20Protocol%20i...

See the bottom of page 8 for the standard recommended settings.

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New Contributor III

Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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We also have done a variety of T38 configurations for all our SIP/FXS handoffs...  so far my testing with this MGCP configuration has made me lean more toward no T38 settings at all.


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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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G711 will work fine as long as you don't have packet loss or too much network jitter.

How are you connecting to the PSTN?

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New Contributor III

Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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Well that is the rub...  We connect via TDM and SIP Trunks.  We are always attempting to use the TDM path and keep the routes from creating too many variables from entering the equation.

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Re: TA 900/900e as a MGCP VOIP/IAD as opposed to Voice User SIP Lines.  What are the disadvantages?

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If you use SIP trunks over the public internet I highly recommend you use t38 for faxing.

Unless you have a really good connection to the internet you will run into problems.

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