Download TROUBLESHOOTING GUIDE

OmniPCX Enterprise
Session Iniation Protcol (SIP)
TROUBLESHOOTING GUIDE No.0069
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The Trunk Group supports high bandwidth calls and as a consequence low bandwidth calls
too. Both G711 and system codec (G729/G723) can be used.
Initial SDP offer content, general case (calling party is not a SIP device nor a SIP trunk).
Trunk Group compression
type
Default
Default
G711
Intra/Extra IP domain
algorithm
With Compression
Without Compression
With Compression
G711
Without Compression
SDP
System algorithm only (G729 for instance)
System algorithm only (G729 for instance)
System algorithm (G729 for instance) in first position
and PCM (A or MU) in the second position
PCM (A or MU) in first position and system algorithm
(G729 for instance) in the second position
8.3.1
nitial answer : the answer to an initial offer on incoming call
Pre-requisite :
The SIP equipment must at least propose one codec supported by OXE in its offer.
OXE Trunk Group used for incoming calls (managed in External SIP Gateway) must be managed
with algo=G711.
OXE always answers with one codec only :
The one proposed in a by the SIP equipment in case of mono-codec offer.
The best one in case of multicodec offer, taking into account :
- SIP equipment list order (calling party prefered codec).
- Called party extra-domain codec.
The answer may be send in 18x and/or 200OK depending on « SDP in 18x » management.
OXE initial SDP answer summary (incoming trunk group algo = G711).
SIP equipment SDP Offer
G729, G711
G729, G711
G711, G729
G711, G729
G711
G711
Intra/Extra IP domain algorithm
With Compression
Without Compression
With Compression
Without Compression
With Compression
Without Compression
Codec use
G729
G729
G729
G711
G711
G711
For SEPLOS users, the OXE is acting as an IPtouch.
8.4
PCS
The SIP is totally operational on PCS; it is able to secure all types of SIP elements, but the SIP equipment
connected must be tested to be sure that it will be able to connect and working on the PCS.
In case of spatial redundancy, the nodename manage on the PCSs must be the same than
the one managed on the CPUs.
Ed. 07
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TG0069