SIP trunk issue

Unanswered Question
Oct 2nd, 2009

I have two CME systems connected using a SIP trunk. In both systems, SCCP was used as a signaling protocol. In that situation all works properly. Then, all phones in one site are converted to SIP. Local calls on this site work properly, but calls across the SIP trunk don't work. When calling from SIP side to SCCP side, a reorder tone is heard. When calling from SCCP side to SIP side, the phone at the SIP side rings but no voice is heard.

Any idea about how to solve it?

I have this problem too.
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Paolo Bevilacqua Fri, 10/02/2009 - 12:28

To avoid this kind of problems and more, leave phones in SCCP as they are designed and tested to be like that.

You will also able to retain you language localization that is Spanish if I'm not wrong.

Nicholas Matthews Mon, 10/05/2009 - 05:28

Try these:

voice service voip

allow sip to sip

no supp sip refer

no supp sip moved

These are general practice SIP-SIP commands that offer higher reliability for supplementary services.

-nick

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