SIP TRUNK CONVERSION

[jesusdavidzambrano]

We currently have a sites using Alcatel PBX`s (Only support E1 connections) .

Our service provider only offer SIP trunks, but we don't want change the PBX.

What we are looking at doing is connect the SIP trunk (30 channel) to a C2901-CME-SRST/K9_SIP10 and transform to a E1 PRI to connect it the PBX.

The questions ares:

1. Need other tipe of licensing? (Because its SIP10, but we seen configurations with more channels than licensing)

2. The cube licensing its mandatory to configure a SIP trunk?

3. The provider brings a SBC, we need a CUBE?

4. Something to keep in mind for prosible problems, misfunctionality or risks?

very thankful for your help

[Chris Deren · Accepted solution]

1 and 2: Yes you need to own CUBE licensing to connect via SIP to carrier. The CUBE licenses are RTU paper licenses that do not get applied to anything at this point.

3: Your CME can serve as CUBE, so no need for separate router

4: Important things to consider: faxing protocol (T38 vs. passthrough), DTMF method, default codec (may require transcoders depending on call flows).

[jesusdavidzambrano]

Thanks Chris.

One more question: our provider SIP trunk is in G.711A, if the PRI Trunk is G711A; In that order, the DSP resources aren't needed?

[Chris Deren]

You should not need any DSPs as long as the codec profile includes the codecs and end devices can understand it.

[Dennis Mink]

Jesus,

you might also want to considering if you are going to use media flow through or flow around on your CUBE (if you have a choice at all). and how many DSP's you need to potential transcoding

Please rate if useful.