Call cracking and noisy

Good day folks,
I got a funny issue here with my freePBX at work; we got two supplier that have a sip trunk on the same platform than us; when calling supplier1, the voice quality is OK, with supplier2, the voice start cracking and noisy; if we call the same supplier2 from one of our vpn on different PBX, the voice quality if clear.
Can anyone ever experienced this type of issue?

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