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7985 and qsig

we have some 7985.

They work fine in the corporate voip network or when they calls pstn numbers directly.

They work with a lot of troubles (one way voice, noise, etc.) when they call passing a trunk qsig with an ericsson PBX (BP250)

When I see phone statistics during these calls, I find:

- packet loss (from 0 to 10%)

- Audio rate (receive) changing randomly from 0 to 64 Kbps.

7940 and 7961 don't have the same troubles using the trunk

Has someone used 7985 with a qsig trunk?

Thanks

1 REPLY
Silver

Re: 7985 and qsig

The QSIG protocol, a series of international standards, defines services and signaling protocols for Private Integrated Services Networks (PISNs). These standards use Integrated Services Digital Networks (ISDN) concepts and conform to the framework of International Standards for Open Systems Interconnection as defined by ISO/IEC. The QSIG protocol acts as a variant of ISDN D-channel voice signaling. The ISDN Q.921 and Q.931 standards provides the basis for QSIG protocol, which sets worldwide standard for PBX interconnection.

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008062b1a5.html#wp1139777

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