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For example, in the default Q.850 to SIP override table, QSIG Cause Codes 34, 38, 41, 42, 47, 58, and 88 map to 503 Service Unavailable. A problem occurs when the Sonus SBC 1000/2000 receives Cause Code 34 from the PSTN. The Sonus SBC 1000/2000 maps it to 503 Service Unavailable, which causes Lync to declare the Sonus SBC 1000/2000 gateway unavailable with Event ID 46046. In this case, the Sonus SBC 1000/2000 administrator may want to override the default mapping in order to prevent Lync from flagging the whole gateway as unavailable. Consider the following illustration.
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1 | Default Q.850 to SIP Override Table |
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This article expands more on this practice, and describes how to configure the Sonus SBC 1000/2000 to perform custom SIP response mapping for SIP to SIP calls.
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In this example we use the SIP to Q850 and Q850 to SIP Override Tables. Upon receiving a SIP response, the Sonus SBC 1000/2000 uses the SIP to Q850 Override Table to map the SIP response to a Q850 Cause Code. Once the Q850 Cause Code is found, the Sonus SBC 1000/2000 uses the Q850 Cause Code, via the Q850 to SIP mapping table, to map it to a SIP response. This behavior is achieved when the default Pass-through SIP Response Code feature is disabled.
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1 | SIP To Q.850 And Q.850 To SIP Override Tables |
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Default Q.850 to SIP and SIP to Q.850 Mapping Tables in Sonus SBC 1000/2000
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- Create a SIP to Q.850 mapping table, which will be used to match the SIP Response to a Q.850 Cause Code for inbound calls.
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1 | Inbound SIP To Q.850 |
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- Create a Q.850 to SIP mapping table, which will be used to match the Q.850 Cause Code to SIP Response for outbound calls.
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1 | Outbound Q.850 To SIP |
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- Disable Pass-through Peer SIP Response Code and select the two mapping tables.
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