Linksys er Cisco SPA9x phones with UC520

Unanswered Question
John Platts Sat, 10/10/2009 - 09:17
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Cisco has released the SPA501G, SPA502G, SPA504G, SPA508G, SPA509G, and SPA525G phones which support the UC500 solution. The SPA502G, SPA504G, SPA508G, SPA509G, and SPA525G phones include the following features, which are not available in the SPA900 series phones:

  • Smart Phone Control Protocol (SPCP)
  • G.722 codec support
  • Configurable through the Cisco Configuration Assistant 2.1 or later (SPA525 phones could be configured in CCA 1.9 and CCA 2.0)
  • Support for CUE 7 applications (such as TimeCardView or WebEx Phone Connect)
  • Support for CME directories

G.722 can be configured for the following phone models on the UC500:

  • 7906G
  • 7911G
  • 7921G
  • 7925G
  • 7941G
  • 7942G
  • 7945G
  • 7961G
  • 7962G
  • 7965G
  • 7970G
  • 7971G
  • 7975G
  • SPA501G
  • SPA502G
  • SPA504G
  • SPA508G
  • SPA509G
  • SPA525G

NOTE: The 7906, 7911, 7941, 7961, 7970, and 7971 phones need the optional wideband handset installed to support G.722. The other models listed above ship with wideband handsets.

To enable the G.722 codec, you will need to make changes to the UC520 configuration through CLI. CCA does not allow you to specify the codecs negotiated on external calls (although you can specify the preferred codec for site-to-site calls for sites managed through the multisite manager in CCA 2.1 or later, but G.722 is not available as a option in CCA 2.1 for site-to-site calls). You can also specify the order in which the codecs will be negotiated for external calls in CLI.

Here is an example for codec negotiation on the UC520:

voice class codec 1

! Make G.722 the preferred codec for calls that support it.

codec preference 1 g722-64

! Negotiate G.711 mu-law codec second

codec preference 2 g711ulaw

! Negotiate G.711 a-law codec third

codec preference 3 g711alaw

! Negotiate G.729 codec if none of the codecs above are negotiated.

codec preference 4 g729r8


! WARNING: DO NOT specify g729br8 as a codec preference if your ITSP does
! not support it. If the ITSP does not support g729br8, outbound calls can fail.

Codecs other than G.711 mu-law, G.711 A-law, and G.729 (without Annex B) might not be supported by your ITSP.

Steven DiStefano Sat, 10/10/2009 - 11:01
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SPA9xx are not supported on UC500 and do not support the SPCP (tokenized SCCP) protocol, which is the usual operation mode for UC500.


Steven DiStefano Mon, 10/12/2009 - 09:49
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Hi Bob,

Good observation :-) 

The Sipura acquisition phones became the Linksys Voice System SIP phones (SPA9xx) and while they were used as the base for the CP52x, CP52x do not run SIP and  there were phone load changes to allow them to run  SPCP protocol, which allows them to run in the SCCP environment of UC500.

SPA9xx cant do that.



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