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SIP Trunk error 503

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FARAT

Systems Engineer
Apr 16, 2018
2
NP
We have faced a problem while interfacing OpenScape Business X5 with SIP Trunk of Service provider. After programming ITSP Trunk in OSB & checking through trace of cap0 file in wireshark, we are getting message 503 error message during outgoing call. Can anyone help us with advice to solve this problem? why this message is received from SIP Server & what might be the solution?
 
On service provider side possible reasons for SIP 503 error messages :

- no circuit available
- network out of order
- temporary failure
- switching equipment congestion
- resource unavailable
- bearer capability not presently available
- incompatible destination
 
Gave seen it when it cannot negogiate a common codec.
Could even be unauthorised (IP not allowed or wrong credentials).
Need to look at the SIP messages in the call flow to determine
 
Hi adibv & theory,

Thanks for response.

The sip message that we have received with error 503 from ITSP

Reason:Q.850
Cause =41 (Temporary Failure)

What would be the probable cause & solution for it?
 
Acc. to mapping Q.850 to SIP Responses based on RFC3398:

Cause 41 Temporary failure - indicates that the network is not functioning correctly and that the condition is not likely to last a long period of time, e.g., the user may wish to try another call attempt almost immediately.

Unfortunately this is not enough to find the error.
Maybe a trace and analysis on provider side could tell more.
Which ITSP do you have ?
 
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