Grandstream GRP2613 Will Not Dial Out But Can Receive Calls

I just came across a rather unusual situation where I could not place calls but I can receive them. This was with a Grandstream GRP2613 (FW using as the VoIP provider. After examining packet traffic I found unexpected information in the SIP header and traced it to some settings under Account–>SIP Settings–>Custom SIP Headers. Specifically, I disabled “Use X-Grandstream-PBX Header” and “Use P-Access-Network-Info Header” which default to be enabled. Please see image below.

















Just wanted to share this in case anyone else runs into this problem.

James Ciesla

James Ciesla is an IT professional who specializes in data management, data analytics, and IT strategy.

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