Think yes. According doc
The “hex” format encodes binary data as 2 hexadecimal digits per byte, most significant nibble first. The entire string is preceded by the sequence \x
According logs kamailio got string with escape \x.
Also according same page
The bytea type supports two external formats for input and output: PostgreSQL's historical “escape” format, and “hex” format. Both of these are always accepted on input. The output format depends on the configuration parameter bytea_output;

I will try make workarround at table config

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